The Borkumer Kleinbahn is a narrow gauge railway on the German island of Borkum in the North Sea. It is the oldest island railway in Germany, beginning operation in 1888.
In 1879, tracks for a horse-drawn railway line were laid for the construction of a new lighthouse. The tracks were converted for locomotive-hauled trains about 10 years later, and the line opened in 1888 as a successor of the horsedrawn line. The network reached its peak length in 1938, with a track length of about. The line celebrated its 125th anniversary on June 15, 2013.