Arthur Delancey "Dan" Ayrault Jr. (January 21, 1935 – February 24, 1990) was an American competitive rower and two-time Olympic gold medalist. While competing at the 1956 Summer Olympics in Melbourne, Australia, Ayrault won a gold medal in coxed pair with Conn Findlay and Kurt Seiffert. During the 1960 Summer Olympics in Rome, Italy, he earned a gold medal in coxless four. Ayrault's teammates were Ted Nash, John Sayre, and Rusty Wailes.