Louis Stephen Klimchock (born October 15, 1939) is an American former professional baseball infielder.

He played parts of 12 seasons in Major League Baseball (MLB) for the Kansas City Athletics, Milwaukee Braves, Washington Senators, New York Mets and Cleveland Indians.

A native of Hostetter, Pennsylvania, Klimchock graduated from Latrobe High School.

In fact, Klimchock's dozen years of MLB service (1958–66; 1968–70) were all partial seasons, punctuated by time spent in the minor leagues.

During his MLB tenure he played in 318 games and had 669 at bats, 64 runs, 155 hits, 21 doubles, 3 triples, 13 home runs, 69 RBI, 31 walks, .232 batting average, .264 on-base percentage, .330 slugging percentage, 221 total bases, 4 sacrifice hits, 6 sacrifice flies and 5 intentional walks.