Robert William Hackett, Jr. (born August 15, 1959) is an American former competition swimmer, Olympic medalist, and former world record-holder.

He represented the United States at the 1976 Summer Olympics in Montreal, Quebec as a 16-year-old, where he won a silver medal in the men's 1500-meter freestyle, finishing behind U.S. teammate Brian Goodell.

Hackett still holds one of the oldest National Age Group records, a 15:03.91 in the 1,500-meter freestyle (long-course meters).

He has made a living in commercial real estate and is volunteer coaching with the Boys and Girls Club of Northern Westchester Marlins.

[3] Hackett now coaches part-time for Emory University's swimming and diving team.