diff --git a/sorting/counting.py b/sorting/counting.py
new file mode 100644
index 0000000..9306b63
--- /dev/null
+++ b/sorting/counting.py
@@ -0,0 +1,19 @@
+ 
+"""Python implementation of in-place counting sort algorithm"""
+
+def countingsort(array, maxval):
+	n = len(array)
+	m = maxval + 1
+    # init with zeros
+	count = [0] * m
+	for a in array:
+	# count occurences
+		count[a] += 1             
+	i = 0
+	for a in range(m):  
+	# make 'count[a]' copies of 'a'          
+		for c in range(count[a]): 
+			array[i] = a
+			i += 1
+	return array
+
diff --git a/tests.py b/tests.py
index 270c350..ca41035 100644
--- a/tests.py
+++ b/tests.py
@@ -55,3 +55,13 @@
         print "Bucket Sort incorrect"
 except:
     print "Bucketsort function errored or is incomplete"
+
+try:
+	from counting import countingsort
+	if(countingsort(list(nums), numpy.max(nums)) == sortedNums):
+		print "Counting Sort success!"
+	else:
+		print "Counting Sort incorrect."
+except:
+	print "Countingsort function errored or is incomplete."
+