1998 Ivy League Baseball Championship Series

The 1998 Ivy League Baseball Championship Series took place at Yale Field in New Haven, Connecticut, on May 12, 1998. The series matched the regular season champions of each of the league's two divisions. , the winner of the series, claimed their second consecutive, and second overall, title and the Ivy League's automatic berth in the 1998 NCAA Division I baseball tournament. It was Harvard's third appearance in the Championship Series, all of which were consecutive, and all of which matched them against Princeton.

Princeton also made their third appearance in the Championship Series. The Tigers won the event in 1996.