Gregory Dion Jelks (16 August 1961 – 6 January 2017) was an American-Australian baseball player who played with the Philadelphia Phillies.

The following year, Jelks hit 24 home runs and 75 RBI for the Spartanburg Spinners in A class ball of the South Atlantic League.

Over the course of eight minor league seasons, Jelks totaled 771 games, 96 home runs, 361 RBI, and a career batting average of .245.

In the 1997 Intercontinental Cup, Jelks batted .471/.538/1.088 to help Australia win a bronze medal for the first time ever in a global event.

Greg Jelks was hired by the Washington Wild Things the following December, and began the 2008 season managing his third Frontier League franchise.

[5] On a flight en route to Australia from the United States, Jelks fell asleep and could not be woken up, later being pronounced dead on January 6, 2017, aged 55.