Robert Kevin Appier (; born December 6, 1967) is an American former professional baseball player.
He played in Major League Baseball as a right-handed pitcher for the Kansas City Royals, Oakland Athletics, New York Mets, and Anaheim Angels.
Appier's solid pitching during his first full season in the majors earned him several rookie accolades in 1990.
His fastball, tight slider and nasty forkball contributed to impressive pitching statistics, distinguishing himself as one of the American League's top right-handed starting pitchers throughout much of the 1990s.
Appier enjoyed the most success with the Royals in the early to mid-1990s as one of the league's earned run average leaders, a Cy Young Award contender in 1993 and culminating in 1995 with a selection to the American League All-Star team.
He was a starting pitcher on the World Series Champion Anaheim Angels in 2002 before retiring four seasons later.