diff --git a/typescript/76-Minimum-Window-Substring.ts b/typescript/76-Minimum-Window-Substring.ts
new file mode 100644
index 000000000..fdeb14d90
--- /dev/null
+++ b/typescript/76-Minimum-Window-Substring.ts
@@ -0,0 +1,48 @@
+function minWindow(s: string, t: string): string {
+    let minL = 0;
+    let minR = s.length;
+
+    //create string t hashmap and needed
+    const tCount = {};
+    let needed = 0;
+    for (let i = 0; i < t.length; i++) {
+        if (t[i] in tCount) tCount[t[i]]++;
+        else {
+            tCount[t[i]] = 1;
+            needed++;
+        }
+    }
+
+    //initialize winCount(empty)
+    const winCount = {};
+    let matched = 0;
+
+    let l = 0;
+
+    for (let r = 0; r < s.length; r++) {
+        //update winCount with adding s[r]
+        if (s[r] in winCount) winCount[s[r]]++;
+        else winCount[s[r]] = 1;
+        //update matched
+        if (s[r] in tCount && winCount[s[r]] === tCount[s[r]]) matched++;
+
+        //the window is valid
+        while (matched === needed) {
+            //update min
+            if (r - l + 1 < minR - minL + 1) {
+                minL = l;
+                minR = r;
+            }
+
+            //remove l
+            //update matched
+            if (s[l] in tCount && winCount[s[l]] === tCount[s[l]]) matched--;
+            //update winCount with the removal of s[l]
+            winCount[s[l]]--;
+            if (winCount[s[l]] === 0) delete winCount[s[l]];
+            l++;
+        }
+    }
+
+    return minR - minL + 1 > s.length ? '' : s.slice(minL, minR + 1);
+}