diff --git a/solution/0100-0199/0137.Single Number II/README.md b/solution/0100-0199/0137.Single Number II/README.md
index 98278806bd4b0..89148166fa930 100644
--- a/solution/0100-0199/0137.Single Number II/README.md	
+++ b/solution/0100-0199/0137.Single Number II/README.md	
@@ -122,6 +122,26 @@ public:
 };
 ```
 
+### **Swift**
+
+```swift
+class Solution {
+  func singleNumber(_ nums: [Int]) -> Int {
+    var a = nums.sorted()
+    var n = a.count
+    for i in stride(from: 0, through: n - 1, by: 3) {
+      if i == n - 1 {
+        return a[i]
+      }
+      else if a[i] != a[i + 1] {
+        return a[i]
+      }
+    }
+    return 0
+  }
+}
+```
+
 ### **...**
 
 ```
diff --git a/solution/0100-0199/0137.Single Number II/README_EN.md b/solution/0100-0199/0137.Single Number II/README_EN.md
index 4402c2590b814..7a02a41565b17 100644
--- a/solution/0100-0199/0137.Single Number II/README_EN.md	
+++ b/solution/0100-0199/0137.Single Number II/README_EN.md	
@@ -101,6 +101,26 @@ public:
 };
 ```
 
+### **Swift**
+
+```swift
+class Solution {
+  func singleNumber(_ nums: [Int]) -> Int {
+    var a = nums.sorted()
+    var n = a.count
+    for i in stride(from: 0, through: n - 1, by: 3) {
+      if i == n - 1 {
+        return a[i]
+      }
+      else if a[i] != a[i + 1] {
+        return a[i]
+      }
+    }
+    return 0
+  }
+}
+```
+
 ### **...**
 
 ```
diff --git a/solution/0100-0199/0137.Single Number II/Solution.swift b/solution/0100-0199/0137.Single Number II/Solution.swift
new file mode 100644
index 0000000000000..bcb3a546fcfb0
--- /dev/null
+++ b/solution/0100-0199/0137.Single Number II/Solution.swift	
@@ -0,0 +1,15 @@
+class Solution {
+  func singleNumber(_ nums: [Int]) -> Int {
+    var a = nums.sorted()
+    var n = a.count
+    for i in stride(from: 0, through: n - 1, by: 3) {
+      if i == n - 1 {
+        return a[i]
+      }
+      else if a[i] != a[i + 1] {
+        return a[i]
+      }
+    }
+    return 0
+  }
+}
\ No newline at end of file