diff --git a/src/test/system/level_2_input_test.js b/src/test/system/level_2_input_test.js
index 150419b74..bf6884b2c 100644
--- a/src/test/system/level_2_input_test.js
+++ b/src/test/system/level_2_input_test.js
@@ -100,7 +100,11 @@ testGroup("Level 2 Input", testOptions, () => {
   test("insertParagraph", async () => {
     await clickToolbarButton({ attribute: "quote" })
     insertString("abc")
+
+    // Insert Enter keydown events to deal with workaround for iOS 18 dictation issues. See `shouldInsertParagraph`.
+    triggerEvent(document.activeElement, "keydown", { key: "Enter", code: "Enter" })
     await performInputTypeUsingExecCommand("insertParagraph", { inputType: "insertParagraph" })
+    triggerEvent(document.activeElement, "keydown", { key: "Enter", code: "Enter" })
     await performInputTypeUsingExecCommand("insertParagraph", { inputType: "insertParagraph" })
 
     assert.blockAttributes([ 0, 4 ], [ "quote" ])
diff --git a/src/trix/controllers/level_2_input_controller.js b/src/trix/controllers/level_2_input_controller.js
index 65b302157..d05f05d70 100644
--- a/src/trix/controllers/level_2_input_controller.js
+++ b/src/trix/controllers/level_2_input_controller.js
@@ -1,4 +1,4 @@
-import { getAllAttributeNames, squishBreakableWhitespace } from "trix/core/helpers"
+import { getAllAttributeNames, shouldInsertParagraph, squishBreakableWhitespace } from "trix/core/helpers"
 import InputController from "trix/controllers/input_controller"
 import * as config from "trix/config"
 
@@ -14,6 +14,8 @@ export default class Level2InputController extends InputController {
 
   static events = {
     keydown(event) {
+      this.saveLastEvent("lastKeydownEvent", event)
+
       if (keyEventIsKeyboardCommand(event)) {
         const command = keyboardCommandFromKeyEvent(event)
         if (this.delegate?.inputControllerDidReceiveKeyboardCommand(command)) {
@@ -71,6 +73,8 @@ export default class Level2InputController extends InputController {
     },
 
     beforeinput(event) {
+      this.saveLastEvent("lastBeforeInputEvent", event)
+
       const handler = this.constructor.inputTypes[event.inputType]
 
       // Handles bug with Siri dictation on iOS 18+.
@@ -441,8 +445,10 @@ export default class Level2InputController extends InputController {
 
     insertParagraph() {
       this.delegate?.inputControllerWillPerformTyping()
-      return this.withTargetDOMRange(function() {
-        return this.responder?.insertLineBreak()
+      return this.withTargetDOMRange(() => {
+        if (shouldInsertParagraph(this.lastKeydownEvent, this.lastBeforeInputEvent)) {
+          return this.responder?.insertLineBreak()
+        }
       })
     },
 
@@ -468,6 +474,12 @@ export default class Level2InputController extends InputController {
     },
   }
 
+  saveLastEvent(name, event) {
+    // Native timestamp is not reliable as some browsers do not update it on keydown.
+    event._timeStamp = Date.now()
+    this[name] = event
+  }
+
   elementDidMutate() {
     if (this.scheduledRender) {
       if (this.composing) {
diff --git a/src/trix/core/helpers/events.js b/src/trix/core/helpers/events.js
index 4248830d3..1f525db3c 100644
--- a/src/trix/core/helpers/events.js
+++ b/src/trix/core/helpers/events.js
@@ -1,6 +1,6 @@
 const testTransferData = { "application/x-trix-feature-detection": "test" }
 
-export const dataTransferIsPlainText = function(dataTransfer) {
+export const dataTransferIsPlainText = function (dataTransfer) {
   const text = dataTransfer.getData("text/plain")
   const html = dataTransfer.getData("text/html")
 
@@ -20,7 +20,7 @@ export const dataTransferIsMsOfficePaste = ({ dataTransfer }) => {
     dataTransfer.getData("text/html").includes("urn:schemas-microsoft-com:office:office")
 }
 
-export const dataTransferIsWritable = function(dataTransfer) {
+export const dataTransferIsWritable = function (dataTransfer) {
   if (!dataTransfer?.setData) return false
 
   for (const key in testTransferData) {
@@ -36,10 +36,26 @@ export const dataTransferIsWritable = function(dataTransfer) {
   return true
 }
 
-export const keyEventIsKeyboardCommand = (function() {
+export const keyEventIsKeyboardCommand = (function () {
   if (/Mac|^iP/.test(navigator.platform)) {
     return (event) => event.metaKey
   } else {
     return (event) => event.ctrlKey
   }
 })()
+
+export function shouldInsertParagraph(keydownEvent, beforeInputEvent) {
+  if (/iPhone|iPad/i.test(navigator.userAgent)) {
+    // Handle duplicated newlines when using dictation on iOS 18+. Upon dictation completion, iOS sends `insertParagraph` events
+    // and shifts the range offset to the next line, resulting in duplicated newlines. This patch ignores these events unless triggered
+    // by an Enter keypress. This workaround is necessary due to the inability to distinguish text entered in dictation mode, as
+    // iOS WebKit doesn’t trigger composition events during dictation (https://bugs.webkit.org/show_bug.cgi?id=261764).
+    if (keydownEvent && beforeInputEvent && Math.abs(keydownEvent._timeStamp - beforeInputEvent._timeStamp) < 1000) {
+      return keydownEvent.key === "Enter" || keydownEvent.key === "Return"
+    } else {
+      return false
+    }
+  } else {
+    return true
+  }
+}