Kentucky Route 155 (KY 155) is a 20.788 mi state highway in the U.S. state of Kentucky. The route originates at a junction with U.S. Route 31E and US 150 (Bardstown Road) in Louisville, Kentucky. On the other side of intersection, KY 155 becomes a local road called Trevilian Way. KY 155 continues through several Louisville suburbs to Jeffersontown, Kentucky and into Spencer County, where it eventually merges with Kentucky Route 55 a few miles north of Taylorsville, Kentucky.