Merwin John William Jacobson (March 7, 1894 – January 13, 1978) was an American backup outfielder in Major League Baseball who played for three different teams between 1915 and 1927.

A decent outfielder with a hard throwing arm, Jacobson entered the majors in 1915 with the New York Giants, playing for them one year before joining the Chicago Cubs in 1916.

During the 1920 season, Jacobsen led the International League with a batting average of .404, 235 hits and 161 runs scored.

His most productive season came in 1926 with Brooklyn, when he posted a .247 batting average with 23 RBI in a career-high 110 games.

In a four-season career, Jacobson hit .230 (76-for-331) with 47 runs and 24 RBI in 133 games, including nine doubles, two triples, seven stolen bases, and a .309 on-base percentage.