diff --git a/Cargo.lock b/Cargo.lock
index 5cb2ab58af..e1747182e3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1078,6 +1078,15 @@ version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "357703d41365b4b27c590e3ed91eabb1b663f07c4c084095e60cbed4362dff0d"
 
+[[package]]
+name = "rustc_version"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfcb3a22ef46e85b45de6ee7e79d063319ebb6594faafcf1c225ea92ab6e9b92"
+dependencies = [
+ "semver",
+]
+
 [[package]]
 name = "rustls"
 version = "0.23.31"
@@ -1169,6 +1178,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "semver"
+version = "1.0.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d767eb0aabc880b29956c35734170f26ed551a859dbd361d140cdbeca61ab1e2"
+
 [[package]]
 name = "serde"
 version = "1.0.228"
@@ -1330,6 +1345,7 @@ dependencies = [
  "pythonize",
  "regex",
  "reqwest",
+ "rustc_version",
  "serde",
  "serde_json",
  "sha2",
diff --git a/changelog.d/19643.feature b/changelog.d/19643.feature
new file mode 100644
index 0000000000..0851623fbf
--- /dev/null
+++ b/changelog.d/19643.feature
@@ -0,0 +1 @@
+Report the Rust compiler version used in the Prometheus metrics. Contributed by Noah Markert.
\ No newline at end of file
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
index 8199a4e02b..bca2f6ed70 100644
--- a/rust/Cargo.toml
+++ b/rust/Cargo.toml
@@ -64,3 +64,4 @@ default = ["extension-module"]
 [build-dependencies]
 blake2 = "0.10.4"
 hex = "0.4.3"
+rustc_version = "0.4.1"
diff --git a/rust/build.rs b/rust/build.rs
index 8755f3bfa3..2a99a9b95d 100644
--- a/rust/build.rs
+++ b/rust/build.rs
@@ -8,6 +8,7 @@
 use std::path::PathBuf;
 
 use blake2::{Blake2b512, Digest};
+use rustc_version::version_meta;
 
 fn main() -> Result<(), std::io::Error> {
     let mut dirs = vec![PathBuf::from("src")];
@@ -48,6 +49,11 @@ fn main() -> Result<(), std::io::Error> {
     let hex_digest = hex::encode(hasher.finalize());
     println!("cargo:rustc-env=SYNAPSE_RUST_DIGEST={hex_digest}");
 
+    let rustc_version = version_meta()
+        .map(|v| v.short_version_string)
+        .unwrap_or_else(|_| "unknown".to_string());
+    println!("cargo:rustc-env=SYNAPSE_RUSTC_VERSION={}", rustc_version,);
+
     // The default rules don't pick up trivial changes to the workspace config
     // files, but we need to rebuild if those change to pick up the changed
     // hashes.
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index a6e01fce64..3b049a51b7 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -30,6 +30,14 @@ fn get_rust_file_digest() -> &'static str {
     env!("SYNAPSE_RUST_DIGEST")
 }
 
+/// Returns the `rustc` version used when this native module was built.
+///
+/// This value is embedded at build time, so it can be exported as a prometheus metrics.
+#[pyfunction]
+pub fn get_rustc_version() -> &'static str {
+    env!("SYNAPSE_RUSTC_VERSION")
+}
+
 /// Formats the sum of two numbers as string.
 #[pyfunction]
 #[pyo3(text_signature = "(a, b, /)")]
@@ -50,6 +58,7 @@ fn reset_logging_config() {
 fn synapse_rust(py: Python<'_>, m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;
     m.add_function(wrap_pyfunction!(get_rust_file_digest, m)?)?;
+    m.add_function(wrap_pyfunction!(get_rustc_version, m)?)?;
     m.add_function(wrap_pyfunction!(reset_logging_config, m)?)?;
 
     acl::register_module(py, m)?;
diff --git a/synapse/metrics/__init__.py b/synapse/metrics/__init__.py
index ba4334e372..cf9aaa7f2d 100644
--- a/synapse/metrics/__init__.py
+++ b/synapse/metrics/__init__.py
@@ -62,6 +62,7 @@ from twisted.web.server import Request
 import synapse.metrics._reactor_metrics  # noqa: F401
 from synapse.metrics._gc import MIN_TIME_BETWEEN_GCS, install_gc_manager
 from synapse.metrics._types import Collector
+from synapse.synapse_rust import get_rustc_version
 from synapse.types import StrSequence
 from synapse.util import SYNAPSE_VERSION
 
@@ -69,6 +70,9 @@ logger = logging.getLogger(__name__)
 
 METRICS_PREFIX = "/_synapse/metrics"
 
+# Rust version used for compilation
+RUSTC_VERSION = get_rustc_version()
+
 HAVE_PROC_SELF_STAT = os.path.exists("/proc/self/stat")
 
 SERVER_NAME_LABEL = "server_name"
@@ -672,15 +676,17 @@ event_processing_lag_by_event = Histogram(
 # consider this process-level because all Synapse homeservers running in the process
 # will use the same Synapse version.
 build_info = Gauge(  # type: ignore[missing-server-name-label]
-    "synapse_build_info", "Build information", ["pythonversion", "version", "osversion"]
+    "synapse_build_info",
+    "Build information",
+    ["pythonversion", "version", "osversion", "rustcversion"],
 )
 build_info.labels(
     " ".join([platform.python_implementation(), platform.python_version()]),
     SYNAPSE_VERSION,
     " ".join([platform.system(), platform.release()]),
+    RUSTC_VERSION,
 ).set(1)
 
-
 synapse_server_name_info = Gauge(
     "synapse_server_name_info",
     "Maps Synapse `server_name`s to the `instance`s they're hosted on",
diff --git a/synapse/synapse_rust/__init__.pyi b/synapse/synapse_rust/__init__.pyi
index d25c609106..cb3eb7df07 100644
--- a/synapse/synapse_rust/__init__.pyi
+++ b/synapse/synapse_rust/__init__.pyi
@@ -1,3 +1,4 @@
 def sum_as_string(a: int, b: int) -> str: ...
 def get_rust_file_digest() -> str: ...
 def reset_logging_config() -> None: ...
+def get_rustc_version() -> str: ...