Cassady is a given name and surname. Notable people with the name include:
- Cassady McClincy (born 2000), American actress
- Carolyn Cassady (1923–2013), American writer
- John Cassaday, American comic book writer-artist
- Harry Cassady, American baseball player
- Howard Cassady, American football player
- John H. Cassady, American admiral
- Neal Cassady, American writer
- Thomas Cassady, American soldier and flying ace