| Ollie Marquardt | |
| Position: | Second baseman |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 22 September 1902 |
| Birth Place: | Toledo, Ohio |
| Death Place: | Port Clinton, Ohio |
| Debutleague: | MLB |
| Debutdate: | April 14 |
| Debutteam: | Boston Red Sox |
| Finalleague: | MLB |
| Finaldate: | June 8 |
| Finalteam: | Boston Red Sox |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .179 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 2 |
| Teams: |
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Albert Ludwig "Ollie" Marquardt (September 22, 1902 – February 7, 1968) was a second baseman in Major League Baseball who played briefly for the Boston Red Sox during the 1931 season. Listed at, 156 lb., Marquardt batted and threw right-handed. He was born in Toledo, Ohio.
Marquardt appeared in 17 games for the hapless 1931 Red Sox as a 28-year-old rookie. He was just one of nine second basemen tried by manager Shano Collins, in a team that finished 6th in American League with a 59–93 record. In 15 fielding appearances, Marquardt played at second base (13), shortstop (1) and third, compiling a collective .947 fielding percentage. He was a .179 hitter (7-for-39) with one double, two RBI and four runs without home runs. He later became a successful minor league manager, posting a 293–189 record for the Class-B Cedar Rapids Raiders of the Three-I League from 1939 through 1942 –including three consecutive championship titles (1940–42)–, and leading the 1944 Toledo Mud Hens to a 95–58 finish in the American Association.
Marquardt died in Port Clinton, Ohio at age 65.