Jeffrey James Kostoff (born August 19, 1965) is an American former competition swimmer who represented the United States at two consecutive Summer Olympics. At the 1984 Summer Olympics in Los Angeles, he finished in sixth place in the final of the men's 400-meter individual medley. Four years later at the 1988 Summer Olympics in Seoul, South Korea, he advanced to the B Final of the 400-meter individual medley and finished ninth overall.
|Full name||Jeffrey James Kostoff|
|National team||United States|
|Born||August 19, 1965|
|Height||6 ft 1 in (1.85 m)|
|Weight||170 lb (77 kg)|
|Strokes||Freestyle, individual medley|
|College team||Stanford University|
He held the national high school record in the 500-yard freestyle for 30 years (1983-2013), and held the Stanford record in the 1,650-yard freestyle for 21 years (1986–2007).
- "Kostoff, Miss Richardson Win 3d Events", The New York Times. June 28, 1983. Section A, p. 24.
- Stanford's fastest NCAA swim meet just isn't fast enough by Keith Peters, Palo Alto Online. Published 2007-03-21; retrieved 2009-06-18
- Interview with Jeff Kostoff by Cheryl Wagner, from the Terrapin Masters Swim Club website; retrieved 2009-06-18.