Donald Ayler (October 5, 1942 – October 21, 2007) was an American jazz trumpeter. He was best known for his participation in concerts and recordings by groups led by his older brother, saxophonist Albert Ayler. An obituary in The Wire praised his "buzzing, declamatory trumpet playing, which was part Holy Roller primitive, part avant garde firebrand".
Ayler was born in Cleveland Heights, Ohio, United States, and grew up in Shaker Heights, graduating from John Adams High School.