The Ahnapee and Western Railway (A&W) was a common carrier shortline railroad located in northeastern Wisconsin.
The railroad ran 34.5 miles (55.5 km) from a connection with the Kewaunee, Green Bay and Western Railroad at Casco Junction to the lakeshore terminals of Algoma in Kewaunee County and Sturgeon Bay in the "Door County thumb" of Wisconsin. Other towns along the line include Casco, Rio Creek, Forestville, Maplewood, and Sawyer. The name of the railroad comes from the city of Ahnapee, which was founded along the Ahnapee River and became Algoma in 1899.