Jaclyn "Jackie" Jeschelnig-Ulm (born November 19, 1979 in Mentor, Ohio) is an American hammer thrower.
A graduate of Ashland University, she won five NCAA Division II and nine Great Lakes Intercollegiate Athletic Conference championship titles in both the hammer and weight throw, and achieved a thirty-ninth-place finish at the 2004 Summer Olympics.
Jeschelnig also owned an outdoor personal best of 68.83 m (225 ft 9 3/4 in) by placing first at the 2004 Ohio State Relays Meet in Columbus, Ohio that secured her a spot on the U.S.