Louis J. Weichmann | |
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| Born | September 29, 1842 Baltimore, Maryland, US |
| Died | June 5, 1902 (aged 59) |
| Occupation(s) | Clerk, schoolteacher |
| Known for | Testifying against Mary Surratt |
Louis J. Weichmann (September 29, 1842 – June 5, 1902) was an American clerk who was one of the chief witnesses for the prosecution in the trial following the assassination of Abraham Lincoln. Previously, he had also been a suspect in the conspiracy because of his association with Mary Surratt's family.