| Käthe Lettner | |
| Nationality: | Austrian |
| Sport: | Alpine skiing |
| Birth Date: | 13 December 1906 |
| Birth Place: | Bad Ischl, Austria-Hungary |
| Death Place: | Salzburg, Austria |
Käthe Lettner (born 13 December 1906, 21 January 1982[1]) was an Austrian alpine skier. She competed in the women's combined event at the 1936 Winter Olympics.[2]