| Kastor Notter | |
| Birth Date: | 16 February 1903 |
| Birth Place: | Niederrohrdorf, Switzerland |
| Death Place: | Brunnen, Switzerland |
| Role: | Rider |
Kastor Notter (16 February 1903 - 9 January 1950) was a Swiss racing cyclist. He was the Swiss National Road Race champion in 1924, 1925 and 1927.[1] He finished in fifth place in the 1926 Paris–Roubaix.[2]