1998 Grinnell Pioneers football team

The 1998 Grinnell Pioneers football team represented Grinnell College of Grinnell, Iowa, as a member of the Midwest Conference (MWC) during the 1998 NCAA Division III football season. In their 11th year under head coach Greg Wallace, the Pioneers compiled a perfect 10–0 record (9–0 against conference opponents) and won the MWC championship. It was Grinnell's first perfect season since 1917.

Quarterback Troy Dougherty completed 208 of 351 passes for 2,790 yards and 32 touchdowns, tied an NCAA record with eight touchdown passes in a game, and was named Midwest Conference offensive player of the year.