Jason Stoltenberg (born April 4, 1970, in Narrabri, Australia) is a former professional tennis player from Australia. Stoltenberg began playing tennis at age ten on an antbed court where his father owned a cotton farm in the Far West (the bush) of New South Wales. In 1987, he won the boy's singles title at the Australian Open and was ranked the World No. 1 junior player. He turned professional later that year, and reached his first tour singles final in 1989 at Livingston, New Jersey.
Stoltenberg's first top-level title was won in 1993 at Manchester. He was also part of the Australian team which finished runners-up in that year's Davis Cup, losing in the final to Germany.
Stoltenberg's best performance at a Grand Slam event came in 1996, when he reached the semi-finals at Wimbledon before being knocked-out by eventual champion Richard Krajicek.
During his career, Stoltenberg won four top-level singles titles and five doubles titles. His career-high rankings were World No. 19 in singles and No. 23 in doubles. His career prize money totalled US$3,305,212. His last singles title came in 1997 at Coral Springs, Florida. He retired from the professional tour in 2001.
After retiring from the tour, Stoltenberg became the coach of Lleyton Hewitt.
