diff --git a/Cargo.lock b/Cargo.lock
index f2dadefeaf0..d710f2970bb 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1677,6 +1677,12 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26bf8fc351c5ed29b5c2f0cbbac1b209b74f60ecd62e675a998df72c49af5204"
 
+[[package]]
+name = "deno_core_icudata"
+version = "0.77.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9efff8990a82c1ae664292507e1a5c6749ddd2312898cdf9cd7cb1fd4bc64c6"
+
 [[package]]
 name = "deranged"
 version = "0.5.4"
@@ -7680,6 +7686,7 @@ dependencies = [
  "criterion",
  "crossbeam-channel",
  "crossbeam-queue",
+ "deno_core_icudata",
  "derive_more 0.99.20",
  "dirs 5.0.1",
  "enum-as-inner",
diff --git a/Cargo.toml b/Cargo.toml
index 369cb19b669..416fd7f65df 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -325,6 +325,9 @@ uuid = { version = "1.18.1", default-features = false }
 # When updating the V8 crate, either update the version and hashes in that file,
 # or ping phoebe @gefjon to do so.
 v8 = "=145.0.0"
+# This version is kept in sync with the version of ICU required by v8.
+# When that changes, the `v8::icu::set_common_data_XX()` function is renamed.
+deno_core_icudata = "0.77"
 
 walkdir = "2.2.5"
 wasmbin = "0.6"
diff --git a/crates/core/Cargo.toml b/crates/core/Cargo.toml
index 3ec0b44e251..f7b4c909d37 100644
--- a/crates/core/Cargo.toml
+++ b/crates/core/Cargo.toml
@@ -51,6 +51,7 @@ bytestring.workspace = true
 chrono.workspace = true
 crossbeam-channel.workspace = true
 crossbeam-queue.workspace = true
+deno_core_icudata.workspace = true
 derive_more.workspace = true
 dirs.workspace = true
 enum-as-inner.workspace = true
diff --git a/crates/core/src/host/v8/mod.rs b/crates/core/src/host/v8/mod.rs
index e21a08e5747..eb4f374ea94 100644
--- a/crates/core/src/host/v8/mod.rs
+++ b/crates/core/src/host/v8/mod.rs
@@ -104,6 +104,13 @@ impl V8RuntimeInner {
     ///
     /// Should only be called once but it isn't unsound to call it more times.
     fn init() -> Self {
+        // If the number in the name of this function is changed, update the version
+        // of the `deno_core_icudata` dep to match the number in the function name.
+        v8::icu::set_common_data_77(deno_core_icudata::ICU_DATA).ok();
+        // Set a default locale for functions like `toLocaleString()`.
+        // en-001 is "International English". <https://www.ctrl.blog/entry/en-001.html>
+        v8::icu::set_default_locale("en-001");
+
         // We don't want idle tasks nor background worker tasks,
         // as we intend to run on a single core.
         // Per the docs, `new_single_threaded_default_platform` requires