| Sayid Ahmad I Persian: {{script|Arab|سید احمد اول | |
| Succession: | Khan of the Golden Horde |
| Reign1: | 1427 – 1455 |
| Predecessor1: | Ulugh Muhammad |
| Successor1: | Küchük Muhammad |
| House: | Borjigin |
| House-Type: | Dynasty |
| Death Date: | 1455 |
| Religion: | Sunni Islam |
Sayid Ahmad I (Turki/Kypchak and Persian: {{Script|Arab|سید احمد خان) was Khan of the Golden Horde from 1427 or 1433[1] until 1455. Unlike the last five of six khans, Ahmad was a younger son of Tokhtamysh.
While he died before the Horde dissolved, historians believe that Sayid Ahmad was responsible for creating the conditions in the khanate which allowed it to happen.[2]