diff --git a/ios/chrome/browser/browser_view/ui_bundled/BUILD.gn b/ios/chrome/browser/browser_view/ui_bundled/BUILD.gn
index d60f96f35fe2c4..0da9bccd328d21 100644
--- a/ios/chrome/browser/browser_view/ui_bundled/BUILD.gn
+++ b/ios/chrome/browser/browser_view/ui_bundled/BUILD.gn
@@ -71,6 +71,7 @@ source_set("ui_bundled") {
     "//ios/chrome/browser/context_menu/ui_bundled:coordinator",
     "//ios/chrome/browser/contextual_panel/coordinator",
     "//ios/chrome/browser/contextual_panel/model",
+    "//ios/chrome/browser/contextual_panel/utils",
     "//ios/chrome/browser/crash_report/model",
     "//ios/chrome/browser/credential_provider_promo/ui_bundled:coordinator",
     "//ios/chrome/browser/default_browser/model:utils",
diff --git a/ios/chrome/browser/browser_view/ui_bundled/browser_coordinator.mm b/ios/chrome/browser/browser_view/ui_bundled/browser_coordinator.mm
index ae852adaf8aa90..9d16e0d5b8b850 100644
--- a/ios/chrome/browser/browser_view/ui_bundled/browser_coordinator.mm
+++ b/ios/chrome/browser/browser_view/ui_bundled/browser_coordinator.mm
@@ -57,6 +57,7 @@
 #import "ios/chrome/browser/context_menu/ui_bundled/context_menu_configuration_provider.h"
 #import "ios/chrome/browser/contextual_panel/coordinator/contextual_sheet_coordinator.h"
 #import "ios/chrome/browser/contextual_panel/model/contextual_panel_tab_helper.h"
+#import "ios/chrome/browser/contextual_panel/utils/contextual_panel_metrics.h"
 #import "ios/chrome/browser/credential_provider_promo/ui_bundled/credential_provider_promo_coordinator.h"
 #import "ios/chrome/browser/default_browser/model/utils.h"
 #import "ios/chrome/browser/default_promo/ui_bundled/default_browser_promo_non_modal_commands.h"
@@ -1570,7 +1571,6 @@ - (void)startTabLifeCycleMediator {
   return webStateList ? webStateList->GetActiveWebState() : nullptr;
 }
 
-// TODO(crbug.com/343734676): Add metrics per dismissal reason type.
 - (void)contextualPanelEntrypointIPHDidDismissWithConfig:
             (base::WeakPtr<ContextualPanelItemConfiguration>)config
                                          dismissalReason:
@@ -1598,6 +1598,8 @@ - (void)contextualPanelEntrypointIPHDidDismissWithConfig:
   if (IPHDismissalReasonType == IPHDismissalReasonType::kTappedAnchorView ||
       IPHDismissalReasonType == IPHDismissalReasonType::kTappedIPH) {
     [self openContextualSheet];
+    [self recordContextualPanelEntrypointIPHDismissed:
+              ContextualPanelIPHDismissedReason::UserInteracted];
     return;
   }
 
@@ -1606,7 +1608,25 @@ - (void)contextualPanelEntrypointIPHDidDismissWithConfig:
       IPHDismissalReasonType == IPHDismissalReasonType::kTappedClose) {
     engagementTracker->NotifyEvent(
         config_ptr->iph_entrypoint_explicitly_dismissed);
+    [self recordContextualPanelEntrypointIPHDismissed:
+              ContextualPanelIPHDismissedReason::UserDismissed];
+    return;
+  }
+
+  if (IPHDismissalReasonType == IPHDismissalReasonType::kTimedOut) {
+    [self recordContextualPanelEntrypointIPHDismissed:
+              ContextualPanelIPHDismissedReason::TimedOut];
+    return;
   }
+
+  [self recordContextualPanelEntrypointIPHDismissed:
+            ContextualPanelIPHDismissedReason::Other];
+}
+
+- (void)recordContextualPanelEntrypointIPHDismissed:
+    (ContextualPanelIPHDismissedReason)dismissalReason {
+  base::UmaHistogramEnumeration("IOS.ContextualPanel.IPH.DismissedReason",
+                                dismissalReason);
 }
 
 #pragma mark - ActivityServiceCommands
diff --git a/ios/chrome/browser/contextual_panel/utils/contextual_panel_metrics.h b/ios/chrome/browser/contextual_panel/utils/contextual_panel_metrics.h
index 9ffcd17b19c6e5..d085dd24aedd76 100644
--- a/ios/chrome/browser/contextual_panel/utils/contextual_panel_metrics.h
+++ b/ios/chrome/browser/contextual_panel/utils/contextual_panel_metrics.h
@@ -34,7 +34,7 @@ enum class PanelBlockImpressionType {
 // LINT.ThenChange(/tools/metrics/histograms/enums.xml:IOSContextualPanelInfoBlockImpression)
 
 // Values of the UMA IOS.ContextualPanel.DismissedReason histogram. Must be
-// kept up to date with IOSContextualPanelInfoBlockImpression in enums.xml.
+// kept up to date with IOSContextualPanelDismissedReason in enums.xml.
 // These values are persisted to logs. Entries should not be renumbered and
 // numeric values should never be reused.
 // LINT.IfChange(ContextualPanelDismissedReason)
@@ -60,4 +60,19 @@ enum class EntrypointInteractionType {
 };
 // LINT.ThenChange(/tools/metrics/histograms/enums.xml:IOSContextualPanelEntrypointInteractionType)
 
+// Values of the UMA IOS.ContextualPanel.IPH.DismissedReason histogram (IPH here
+// is an acronym for in-product help). Must be kept up to date with
+// IOSContextualPanelIPHDismissedReason in enums.xml. These values are persisted
+// to logs. Entries should not be renumbered and numeric values should never be
+// reused.
+// LINT.IfChange(ContextualPanelIPHDismissedReason)
+enum class ContextualPanelIPHDismissedReason {
+  Other = 0,
+  UserDismissed = 1,
+  TimedOut = 2,
+  UserInteracted = 3,  // The user clicked on the IPH or the entrypoint.
+  kMaxValue = UserInteracted,
+};
+// LINT.ThenChange(/tools/metrics/histograms/enums.xml:IOSContextualPanelIPHDismissedReason)
+
 #endif  // IOS_CHROME_BROWSER_CONTEXTUAL_PANEL_UTILS_CONTEXTUAL_PANEL_METRICS_H_
diff --git a/tools/metrics/histograms/enums.xml b/tools/metrics/histograms/enums.xml
index 735ae19b0b9f21..8535cd87660371 100644
--- a/tools/metrics/histograms/enums.xml
+++ b/tools/metrics/histograms/enums.xml
@@ -13231,6 +13231,18 @@ Called by update_permissions_policy_enum.py.-->
 
 <!-- LINT.ThenChange(//ios/chrome/browser/contextual_panel/utils/contextual_panel_metrics.h:PanelBlockImpressionType) -->
 
+<!-- LINT.IfChange(ContextualPanelIPHDismissedReason) -->
+
+<enum name="IOSContextualPanelIPHDismissedReason">
+  <int value="0" label="Other/unknown, such as switching tabs"/>
+  <int value="1"
+      label="User dismissed (swiped IPH or tapped outside web content area)"/>
+  <int value="2" label="Timed out"/>
+  <int value="3" label="User clicked IPH or entrypoint"/>
+</enum>
+
+<!-- LINT.ThenChange(//ios/chrome/browser/contextual_panel/utils/contextual_panel_metrics.h:ContextualPanelIPHDismissedReason) -->
+
 <!-- LINT.IfChange(IOSContextualPanelItemType) -->
 
 <enum name="IOSContextualPanelItemType">
diff --git a/tools/metrics/histograms/metadata/ios/histograms.xml b/tools/metrics/histograms/metadata/ios/histograms.xml
index 67e2298d99fc65..797a69af00ce13 100644
--- a/tools/metrics/histograms/metadata/ios/histograms.xml
+++ b/tools/metrics/histograms/metadata/ios/histograms.xml
@@ -516,6 +516,16 @@ chromium-metrics-reviews@google.com.
   <token key="ContextualPanelItemType" variants="ContextualPanelItemType"/>
 </histogram>
 
+<histogram name="IOS.ContextualPanel.IPH.DismissedReason"
+    enum="IOSContextualPanelIPHDismissedReason" expires_after="2025-06-30">
+  <owner>nicolasmacbeth@google.com</owner>
+  <owner>bling-mony-pod@google.com</owner>
+  <summary>
+    The reason the Contextual Panel's entrypoint in-product help (IPH) was
+    dismissed.
+  </summary>
+</histogram>
+
 <histogram name="IOS.ContextualPanel.Model.InfoBlocksWithContentCount"
     units="count" expires_after="2025-06-30">
   <owner>rkgibson@google.com</owner>