Donald Nally (born December 27, 1960) is an American conductor, chorus master, and professor of conducting, specializing in chamber choirs, opera, and new music. He is conductor of the professional new-music choir, The Crossing, based in Philadelphia. He is the director of both the Westminster Choir and Westminster Symphonic Choir at Westminster Choir College in New Jersey.

Nally has been chorus master of Lyric Opera of Chicago, Welsh National Opera, Opera Philadelphia, and the Festival dei Due Mondi in Spoleto, Italy.

He has been nominated seven times for the Grammy Award for Best Choral Performance, winning in 2018, 2019, and 2023. He has won numerous awards and is recognized as one of the leading commissioners of new music in the United States.