diff --git a/rust/src/push/base_rules.rs b/rust/src/push/base_rules.rs
index cb4bab0cf2..54d26f30e9 100644
--- a/rust/src/push/base_rules.rs
+++ b/rust/src/push/base_rules.rs
@@ -297,6 +297,22 @@ pub const BASE_APPEND_OVERRIDE_RULES: &[PushRule] = &[
         default: true,
         default_enabled: true,
     },
+    // MSC4505: explicitly suppress live location share beacon updates in unencrypted
+    // rooms (in encrypted rooms they arrive as m.room.encrypted and can only be
+    // suppressed client-side after decryption).
+    PushRule {
+        rule_id: Cow::Borrowed("global/override/.org.matrix.msc4505.rule.beacon"),
+        priority_class: 5,
+        conditions: Cow::Borrowed(&[Condition::Known(KnownCondition::EventMatch(
+            EventMatchCondition {
+                key: Cow::Borrowed("type"),
+                pattern: Cow::Borrowed("org.matrix.msc3672.beacon"),
+            },
+        ))]),
+        actions: Cow::Borrowed(&[]),
+        default: true,
+        default_enabled: true,
+    },
 ];
 
 pub const BASE_APPEND_CONTENT_RULES: &[PushRule] = &[PushRule {
@@ -746,7 +762,7 @@ pub const BASE_APPEND_UNDERRIDE_RULES: &[PushRule] = &[
         default_enabled: true,
     },
     PushRule {
-        rule_id: Cow::Borrowed("global/underride/.io.element.rule.beacon_info_one_to_one"),
+        rule_id: Cow::Borrowed("global/underride/.org.matrix.msc4505.rule.beacon_info_one_to_one"),
         priority_class: 1,
         conditions: Cow::Borrowed(&[
             Condition::Known(KnownCondition::RoomMemberCount {
@@ -766,7 +782,7 @@ pub const BASE_APPEND_UNDERRIDE_RULES: &[PushRule] = &[
         default_enabled: true,
     },
     PushRule {
-        rule_id: Cow::Borrowed("global/underride/.io.element.rule.beacon_info"),
+        rule_id: Cow::Borrowed("global/underride/.org.matrix.msc4505.rule.beacon_info"),
         priority_class: 1,
         conditions: Cow::Borrowed(&[
             Condition::Known(KnownCondition::EventMatch(EventMatchCondition {
diff --git a/rust/src/push/mod.rs b/rust/src/push/mod.rs
index 70dd3b1884..51eb0cdda6 100644
--- a/rust/src/push/mod.rs
+++ b/rust/src/push/mod.rs
@@ -566,7 +566,7 @@ pub struct FilteredPushRules {
     msc4028_push_encrypted_events: bool,
     msc4210_enabled: bool,
     msc4306_enabled: bool,
-    mscxxxx_beacon_push_rules_enabled: bool,
+    msc4505_enabled: bool,
     mscxxxx_knock_push_rule_enabled: bool,
 }
 
@@ -583,7 +583,7 @@ impl FilteredPushRules {
         msc4028_push_encrypted_events: bool,
         msc4210_enabled: bool,
         msc4306_enabled: bool,
-        mscxxxx_beacon_push_rules_enabled: bool,
+        msc4505_enabled: bool,
         mscxxxx_knock_push_rule_enabled: bool,
     ) -> Self {
         Self {
@@ -595,7 +595,7 @@ impl FilteredPushRules {
             msc4028_push_encrypted_events,
             msc4210_enabled,
             msc4306_enabled,
-            mscxxxx_beacon_push_rules_enabled,
+            msc4505_enabled,
             mscxxxx_knock_push_rule_enabled,
         }
     }
@@ -633,8 +633,8 @@ impl FilteredPushRules {
                     return false;
                 }
 
-                if !self.mscxxxx_beacon_push_rules_enabled
-                    && rule.rule_id.contains("/.io.element.rule.beacon_info")
+                if !self.msc4505_enabled
+                    && rule.rule_id.contains("/.org.matrix.msc4505.rule.beacon")
                 {
                     return false;
                 }
diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index e489928180..c33c4ad108 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -156,12 +156,11 @@ class ExperimentalConfig(Config):
             "msc3381_polls_enabled", False
         )
 
-        # MSCXXXX (unnumbered draft): default push rules for live location share
-        # beacon_info start events (the MSC3672 state event). Unstable rule ids:
-        # .io.element.rule.beacon_info(_one_to_one).
-        self.mscxxxx_beacon_push_rules_enabled: bool = experimental.get(
-            "mscxxxx_beacon_push_rules_enabled", False
-        )
+        # MSC4505: default push rules for live location sharing — notify on
+        # beacon_info start events (the MSC3672 state event), suppress beacon
+        # updates. Unstable rule ids: .org.matrix.msc4505.rule.beacon_info
+        # (_one_to_one) / .org.matrix.msc4505.rule.beacon.
+        self.msc4505_enabled: bool = experimental.get("msc4505_enabled", False)
 
         # MSCXXXX (unnumbered draft): default push rule notifying room members
         # who can act on a knock (MSC2403), via the new `recipient_permission`
diff --git a/synapse/storage/databases/main/push_rule.py b/synapse/storage/databases/main/push_rule.py
index 61b1291722..a8f9b3d77a 100644
--- a/synapse/storage/databases/main/push_rule.py
+++ b/synapse/storage/databases/main/push_rule.py
@@ -107,7 +107,7 @@ def _load_rules(
         msc4028_push_encrypted_events=experimental_config.msc4028_push_encrypted_events,
         msc4210_enabled=experimental_config.msc4210_enabled,
         msc4306_enabled=experimental_config.msc4306_enabled,
-        mscxxxx_beacon_push_rules_enabled=experimental_config.mscxxxx_beacon_push_rules_enabled,
+        msc4505_enabled=experimental_config.msc4505_enabled,
         mscxxxx_knock_push_rule_enabled=experimental_config.mscxxxx_knock_push_rule_enabled,
     )
 
diff --git a/synapse/synapse_rust/push.pyi b/synapse/synapse_rust/push.pyi
index 64fd6bb7c1..715ae5df55 100644
--- a/synapse/synapse_rust/push.pyi
+++ b/synapse/synapse_rust/push.pyi
@@ -50,7 +50,7 @@ class FilteredPushRules:
         msc4028_push_encrypted_events: bool,
         msc4210_enabled: bool,
         msc4306_enabled: bool,
-        mscxxxx_beacon_push_rules_enabled: bool,
+        msc4505_enabled: bool,
         mscxxxx_knock_push_rule_enabled: bool,
     ): ...
     def rules(self) -> Collection[tuple[PushRule, bool]]: ...