| Fritz Kater | |
| Birth Date: | 19 December 1861 |
| Birth Place: | Barleben |
| Death Place: | Berlin |
| Occupation: | trade unionist |
Fritz Kater (1861–1945) was a German trade unionist, publisher, and anarcho-syndicalist. He was active in the Free Association of German Trade Unions (FVdG) and its successor organization, the Free Workers' Union of Germany. He edited the FVdG's periodical Einigkeit and after World War I owned the publishing houses Fritz Kater Verlag and Syndikalist.[1]