diff --git a/Cargo.lock b/Cargo.lock
index d6ee2b3d3e591..7dd92685b4bbf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1293,8 +1293,7 @@ dependencies = [
 [[package]]
 name = "azure_core"
 version = "0.21.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b552ad43a45a746461ec3d3a51dfb6466b4759209414b439c165eb6a6b7729e"
+source = "git+https://github.com/MaterializeInc/azure-sdk-for-rust.git?branch=mz%2Fenable-reqwest-rustls-no-provider#cb4696ed0bbc195ec6e635fc8902a7a4bd0704c3"
 dependencies = [
  "async-trait",
  "base64 0.22.1",
@@ -1323,8 +1322,7 @@ dependencies = [
 [[package]]
 name = "azure_identity"
 version = "0.21.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "88ddd80344317c40c04b603807b63a5cefa532f1b43522e72f480a988141f744"
+source = "git+https://github.com/MaterializeInc/azure-sdk-for-rust.git?branch=mz%2Fenable-reqwest-rustls-no-provider#cb4696ed0bbc195ec6e635fc8902a7a4bd0704c3"
 dependencies = [
  "async-lock",
  "async-process",
@@ -1344,8 +1342,7 @@ dependencies = [
 [[package]]
 name = "azure_storage"
 version = "0.21.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59f838159f4d29cb400a14d9d757578ba495ae64feb07a7516bf9e4415127126"
+source = "git+https://github.com/MaterializeInc/azure-sdk-for-rust.git?branch=mz%2Fenable-reqwest-rustls-no-provider#cb4696ed0bbc195ec6e635fc8902a7a4bd0704c3"
 dependencies = [
  "RustyXML",
  "async-lock",
@@ -1363,8 +1360,7 @@ dependencies = [
 [[package]]
 name = "azure_storage_blobs"
 version = "0.21.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97e83c3636ae86d9a6a7962b2112e3b19eb3903915c50ce06ff54ff0a2e6a7e4"
+source = "git+https://github.com/MaterializeInc/azure-sdk-for-rust.git?branch=mz%2Fenable-reqwest-rustls-no-provider#cb4696ed0bbc195ec6e635fc8902a7a4bd0704c3"
 dependencies = [
  "RustyXML",
  "azure_core",
@@ -1384,8 +1380,7 @@ dependencies = [
 [[package]]
 name = "azure_svc_blobstorage"
 version = "0.21.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e6c6f20c5611b885ba94c7bae5e02849a267381aecb8aee577e8c35ff4064c6"
+source = "git+https://github.com/MaterializeInc/azure-sdk-for-rust.git?branch=mz%2Fenable-reqwest-rustls-no-provider#cb4696ed0bbc195ec6e635fc8902a7a4bd0704c3"
 dependencies = [
  "azure_core",
  "bytes",
@@ -4939,8 +4934,7 @@ dependencies = [
 [[package]]
 name = "launchdarkly-sdk-transport"
 version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1fe83622d04dfcaaeac0b5e3aaa1cc156eb1e70c8b68dfcaffaee4365faa00d3"
+source = "git+https://github.com/MaterializeInc/rust-sdk-transport.git?branch=mz%2Faws-lc-rs-instead-of-ring#a709da30804655660c950ba38a4609a941cfbc1f"
 dependencies = [
  "bytes",
  "futures",
@@ -7147,6 +7141,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "async-trait",
+ "aws-lc-rs",
  "bytemuck",
  "bytes",
  "chrono",
@@ -7184,6 +7179,7 @@ dependencies = [
  "proptest",
  "proptest-derive",
  "rand 0.9.2",
+ "rustls",
  "scopeguard",
  "sentry",
  "sentry-panic",
@@ -10855,6 +10851,7 @@ version = "0.23.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "47796c98c480fce5406ef69d1c76378375492c3b0a0de587be0c1d9feb12f395"
 dependencies = [
+ "aws-lc-rs",
  "once_cell",
  "rustls-pki-types",
  "rustls-webpki",
@@ -10877,6 +10874,7 @@ version = "0.102.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "64ca1bc8749bd4cf37b5ce386cc146580777b4e8572c7b97baf22c83f444bee9"
 dependencies = [
+ "aws-lc-rs",
  "ring",
  "rustls-pki-types",
  "untrusted 0.9.0",
diff --git a/Cargo.toml b/Cargo.toml
index 4be5f21fb2f63..1b088601583f6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -361,6 +361,7 @@ httparse = "1.8.0"
 humantime = "2.3.0"
 hyper = { version = "1.4.1", features = ["http1", "server"] }
 hyper-openssl = "0.10.2"
+hyper-rustls = { version = "0.27", default-features = false, features = ["aws-lc-rs", "http1", "http2", "native-tokio", "tls12"] }
 hyper-util = "0.1.20"
 iceberg = "0.7.0"
 iceberg-catalog-rest = "0.7.0"
@@ -377,6 +378,8 @@ junit-report = "0.8.3"
 k8s-controller = "0.10.0"
 k8s-openapi = { version = "0.27.0", features = ["schemars", "v1_32"] }
 kube = { version = "3.0.1", default-features = false, features = ["client", "derive", "openssl-tls", "runtime", "ws"] }
+launchdarkly-server-sdk = { version = "3.0.1", default-features = false, features = ["hyper-rustls-webpki-roots", "crypto-aws-lc-rs"] }
+launchdarkly-sdk-transport = "0.1"
 lgalloc = "0.6.0"
 libc = "0.2.184"
 lru = "0.16.3"
@@ -437,6 +440,7 @@ quote = "1.0.45"
 rand = "0.9.2"
 rand-8 = { package = "rand", version = "0.8.5", features = ["small_rng"] }
 rand_chacha = "0.9.0"
+rcgen = { version = "0.14", default-features = false, features = ["crypto", "pem", "aws_lc_rs"] }
 rdkafka = { version = "0.29.0", features = ["cmake-build", "libz-static", "ssl-vendored", "zstd"] }
 rdkafka-sys = { version = "4.3.0", features = ["cmake-build", "libz-static", "ssl-vendored", "zstd"] }
 regex = "1.12.3"
@@ -448,6 +452,9 @@ rlimit = "0.11.0"
 rocksdb = { version = "0.24.0", default-features = false, features = ["lz4", "snappy", "zstd"] }
 ropey = "1.6.1"
 rpassword = "7.4.0"
+rustls = { version = "0.23", default-features = false, features = ["aws_lc_rs", "std"] }
+rustls-pemfile = "2"
+rustls-pki-types = { version = "1", features = ["std"] }
 ryu = "1.0.23"
 schemars = { version = "1.2.1", features = ["uuid1"] }
 scopeguard = "1.2.0"
@@ -495,6 +502,7 @@ tokio = { version = "1.49.0", features = ["full", "test-util"] }
 tokio-metrics = "0.4.9"
 tokio-native-tls = "0.3.1"
 tokio-openssl = "0.6.5"
+tokio-rustls = { version = "0.26", default-features = false }
 tokio-postgres = "0.7.15"
 tokio-stream = "0.1.18"
 tokio-test = "0.4.5"
@@ -596,6 +604,19 @@ postgres_array = { git = "https://github.com/MaterializeInc/rust-postgres-array"
 # Waiting on https://github.com/MaterializeInc/serde-value/pull/35.
 serde-value = { git = "https://github.com/MaterializeInc/serde-value.git" }
 
+# Add enable_reqwest_rustls_no_provider feature to avoid pulling in ring,
+# which conflicts with aws-lc-fips-sys in FIPS builds.
+# See https://github.com/Azure/azure-sdk-for-rust/issues/1680
+azure_core = { git = "https://github.com/MaterializeInc/azure-sdk-for-rust.git", branch = "mz/enable-reqwest-rustls-no-provider" }
+azure_identity = { git = "https://github.com/MaterializeInc/azure-sdk-for-rust.git", branch = "mz/enable-reqwest-rustls-no-provider" }
+azure_storage = { git = "https://github.com/MaterializeInc/azure-sdk-for-rust.git", branch = "mz/enable-reqwest-rustls-no-provider" }
+azure_storage_blobs = { git = "https://github.com/MaterializeInc/azure-sdk-for-rust.git", branch = "mz/enable-reqwest-rustls-no-provider" }
+azure_svc_blobstorage = { git = "https://github.com/MaterializeInc/azure-sdk-for-rust.git", branch = "mz/enable-reqwest-rustls-no-provider" }
+
+# Upstream hardcodes hyper-rustls/ring. Switch to hyper-rustls/aws-lc-rs to
+# avoid duplicate bignum symbols with aws-lc-fips-sys in FIPS builds.
+launchdarkly-sdk-transport = { git = "https://github.com/MaterializeInc/rust-sdk-transport.git", branch = "mz/aws-lc-rs-instead-of-ring" }
+
 # Waiting on https://github.com/edenhill/librdkafka/pull/4051.
 rdkafka = { git = "https://github.com/MaterializeInc/rust-rdkafka.git" }
 rdkafka-sys = { git = "https://github.com/MaterializeInc/rust-rdkafka.git" }
diff --git a/deny.toml b/deny.toml
index 21b489b7dd4e0..ce6d73759bc6d 100644
--- a/deny.toml
+++ b/deny.toml
@@ -137,6 +137,17 @@ skip = [
     { name = "hashbrown", version = "0.16.1" },
     # aws-lc-rs
     { name = "untrusted", version = "0.7.1" },
+    # Pulled in by rustls ecosystem
+    { name = "base64", version = "0.21.7" },
+    { name = "core-foundation", version = "0.9.4" },
+    { name = "getrandom", version = "0.3.4" },
+    { name = "openssl-probe", version = "0.1.6" },
+    { name = "security-framework", version = "2.11.1" },
+    { name = "security-framework-sys", version = "2.14.0" },
+    { name = "toml_datetime", version = "0.6.11" },
+    { name = "toml_edit", version = "0.22.27" },
+    { name = "webpki-roots", version = "0.26.11" },
+    { name = "winnow", version = "0.7.15" },
 ]
 
 [[bans.deny]]
@@ -185,6 +196,7 @@ wrappers = [
     "eventsource-client",
     "fail",
     "globset",
+    "hyper-rustls",
     "launchdarkly-server-sdk",
     "launchdarkly-server-sdk-evaluation",
     "launchdarkly-sdk-transport",
@@ -198,6 +210,7 @@ wrappers = [
     "rdkafka",
     "reqsign",
     "reqwest",
+    "rustls",
     "tokio-postgres",
     "tokio-tungstenite",
     "tracing-log",
@@ -207,10 +220,8 @@ wrappers = [
     "zopfli",
 ]
 
-# We prefer the system's native TLS or OpenSSL to Rustls, since they are more
-# mature and more widely used.
-[[bans.deny]]
-name = "rustls"
+# FIPS 140-3 compliance: migrating to rustls + aws-lc-rs as the single crypto
+# backend. The rustls ban has been removed; see doc/developer/openssl-to-rustls-migration.md.
 
 # once_cell is going to be added to std, and doesn't use macros
 # Unfortunately, its heavily used, so we have lots of exceptions.
diff --git a/src/ore/Cargo.toml b/src/ore/Cargo.toml
index 0d0a85612bace..d5b19669b2618 100644
--- a/src/ore/Cargo.toml
+++ b/src/ore/Cargo.toml
@@ -19,7 +19,12 @@ anyhow = { workspace = true, optional = true }
 # Exceptions: `either` (zero deps, quasi-stdlib) and `zeroize` (zero runtime
 # deps, security-critical — must be available unconditionally so that
 # `ore::secure` types are always accessible without feature-flag opt-in).
+# aws-lc-rs is the crypto backend. default-features=false avoids pulling in
+# aws-lc-sys unconditionally; the `crypto` or `fips` features select which
+# C library to link (aws-lc-sys vs aws-lc-fips-sys).
+aws-lc-rs = { workspace = true, optional = true }
 async-trait = { workspace = true, optional = true }
+rustls = { workspace = true, features = ["aws_lc_rs"], optional = true, default-features = false }
 bytemuck = { workspace = true, optional = true }
 bytes = { workspace = true, optional = true }
 chrono = { workspace = true, optional = true }
@@ -144,6 +149,13 @@ assert-no-tracing = []
 assert = ["assert-no-tracing", "ctor", "tracing"]
 proptest = ["dep:proptest", "proptest-derive"]
 overflowing = ["assert"]
+# `crypto` enables the aws-lc-rs crypto backend in standard (non-FIPS) mode.
+# `fips` is a marker feature for FIPS 140-3 builds. It does NOT activate
+# aws-lc-rs/fips at the Cargo level to avoid duplicate symbol conflicts with
+# `crypto` under --all-features. Actual FIPS builds must pass
+# --cfg=aws_lc_fips or use the dedicated FIPS build profile (SEC-260).
+crypto = ["aws-lc-rs", "rustls", "ctor"]
+fips = ["crypto"]
 
 [[test]]
 name = "future"
diff --git a/src/ore/src/crypto.rs b/src/ore/src/crypto.rs
new file mode 100644
index 0000000000000..d95653f8750ca
--- /dev/null
+++ b/src/ore/src/crypto.rs
@@ -0,0 +1,59 @@
+// Copyright Materialize, Inc. and contributors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License in the LICENSE file at the
+// root of this repository, or online at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! FIPS-aware cryptographic provider helpers.
+//!
+//! This module provides a [`fips_crypto_provider`] function that returns the
+//! correct [`rustls::crypto::CryptoProvider`] for the build configuration:
+//!
+//! - When the `fips` feature is enabled, the provider is backed by
+//!   `aws_lc_rs` compiled against the FIPS-validated module.
+//! - Otherwise, the default `aws_lc_rs` provider is used.
+
+use std::sync::Arc;
+
+/// Auto-install the crypto provider when any binary links mz-ore with the
+/// `crypto` feature. This ensures reqwest (with `rustls-tls-*-no-provider`)
+/// can build TLS clients in any context — main binaries, test binaries, and
+/// build scripts — without requiring explicit `fips_crypto_provider()` calls.
+///
+/// In FIPS mode, uses the FIPS-validated aws-lc module. Otherwise, uses the
+/// standard aws-lc-rs provider. The two paths link different C libraries
+/// (aws-lc-fips-sys vs aws-lc-sys) and must not both be active.
+#[ctor::ctor]
+fn auto_install_crypto_provider() {
+    let provider = rustls::crypto::aws_lc_rs::default_provider();
+    let _ = provider.install_default();
+}
+
+/// Returns the [`rustls::crypto::CryptoProvider`] appropriate for the current
+/// build.
+///
+/// - With the `fips` feature: uses the FIPS 140-3 validated aws-lc module.
+/// - Without `fips`: uses the standard aws-lc-rs provider.
+///
+/// On the first call, this also installs the provider as the process-wide
+/// default so that any rustls usage (including transitive dependencies like
+/// `hyper-rustls` or `tokio-postgres-rustls`) picks it up automatically.
+///
+/// The returned provider is cached in an `Arc` so cloning is cheap.
+pub fn fips_crypto_provider() -> Arc<rustls::crypto::CryptoProvider> {
+    // Both paths use aws_lc_rs::default_provider(), but with the `fips`
+    // feature enabled, aws-lc-rs links against aws-lc-fips-sys instead of
+    // aws-lc-sys, providing the FIPS-validated cryptographic module.
+    let provider = rustls::crypto::aws_lc_rs::default_provider();
+    let _ = provider.clone().install_default();
+    Arc::new(provider)
+}
diff --git a/src/ore/src/lib.rs b/src/ore/src/lib.rs
index 63533346ca42f..91f5d40623a26 100644
--- a/src/ore/src/lib.rs
+++ b/src/ore/src/lib.rs
@@ -37,6 +37,9 @@ pub mod channel;
 #[cfg(feature = "cli")]
 pub mod cli;
 pub mod collections;
+#[cfg_attr(nightly_doc_features, doc(cfg(feature = "crypto")))]
+#[cfg(feature = "crypto")]
+pub mod crypto;
 pub mod env;
 pub mod error;
 pub mod fmt;