The topic of this article may not meet Wikipedia's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted.Find sources: "Lou Nagelsen" – news · newspapers · books · scholar · JSTOR (December 2023) (Learn how and when to remove this template message)
Lou Nagelsen
Catcher
Born: (1887-06-29)June 29, 1887
Piqua, Ohio, United States
Died: October 21, 1965(1965-10-21) (aged 78)
Fort Wayne, Indiana, United States
Batted: Right
Threw: Right
MLB debut
September 10, 1912, for the Cleveland Naps
Last MLB appearance
September 16, 1912, for the Cleveland Naps
MLB statistics
Batting average.000
Home runs0
Runs batted in6
Teams

Louis Marcellus Nagelsen (born Louis Marcellus Nagelsisen) (June 29, 1887 – October 21, 1965) was a Major League Baseball catcher who played for one season. He played for the Cleveland Naps for two games during the 1912 Cleveland Naps season. He attended the University of Notre Dame.