Ronald Thomas Campbell (April 5, 1940 – February 2, 2023) was an American right-handed infielder in Major League Baseball for the Chicago Cubs.

After going 0-for-8 in his first two contests, Campbell singled off Cincinnati Reds pitcher John Tsitouris in his first at-bat on September 3, 1964, not only recording his first major league hit, but also his first RBI as teammate Len Gabrielson scored from third to give the Cubs a 1–0 lead.

In lieu of Joey Amalfitano, Campbell went on to start at second base for all but two of the Cubs' remaining games that season, sharing the field with future Hall of Famers Billy Williams and Ernie Banks.

He hit his first and only major league home run on September 6 of that season against the St. Louis Cardinals' Ray Sadecki.

[2] Campbell finished his brief 1964 campaign with the Cubs with a batting average of .272, six doubles, a triple, a home run, and 10 RBI in just 92 at-bats.