New York State Route 157A (NY 157A) is an east–west state highway located in Albany County, New York, in the United States. It serves as a loop route of NY 157 through the towns of Knox and Berne, veering a considerable distance to the south to serve the hamlet of East Berne and indirectly connect NY 157 to NY 443. NY 157A rejoins NY 157 near the access road to Thompson's Lake State Park, which is along NY 157. It is a two-lane highway its entire length. NY 157A, like its parent route, was assigned in 1930 to its current routing.
