Ady is a surname. Notable people with the surname include:
- Cindy Ady (born 1956/57), Canadian politician
- Endre Ady (1877–1919), Hungarian poet and journalist
- Mariska Ady (1888–1977), Hungarian writer and poet, niece of Endre
- Thomas Ady (fl. 17th century), English physician and humanist
- William Ady (1816–1882), English archdeacon
- William M. Ady (died 1872), American politician