diff --git a/Binary_search.js b/Binary_search.js
new file mode 100644
index 0000000..bd15b67
--- /dev/null
+++ b/Binary_search.js
@@ -0,0 +1,16 @@
+function binarySearch(arr, num) {
+  let startPoint = 0;
+  let endPoint = arr.length - 1;
+  let middle = Math.floor((startPoint + endPoint) / 2);
+  while (arr[middle] !== num && startPoint <= endPoint) {
+    if (num > arr[middle]) {
+      startPoint = middle + 1;
+    } else {
+      endPoint = middle - 1;
+    }
+    middle = Math.floor((startPoint + endPoint) / 2);
+  }
+
+  return arr[middle] === num ? middle : -1;
+}
+