| Club: | Chelsea |
| Season: | 1949–50 |
| Manager: | Billy Birrell |
| Chairman: | Joe Mears |
| Stadium: | Stamford Bridge |
| League: | First Division |
| League Result: | 13th |
| Cup1: | FA Cup |
| Cup1 Result: | Semi-finals |
| League Topscorer: | Roy Bentley (17) Hugh Billington (17) |
| Season Topscorer: | Roy Bentley (22) |
| Largest Win: | 3–0 (five matches) |
| Largest Loss: | 0–4 v Portsmouth 0–4 v Aston Villa |
| Highest Attendance: | |
| Lowest Attendance: | |
| Pattern B1: | _chelsea1907h |
| Pattern So1: | _2bluestripes |
| Leftarm1: | 0000FF |
| Body1: | FFFFFF |
| Rightarm1: | 0000FF |
| Shorts1: | ffffFF |
| Socks1: | 000000 |
| Pattern B2: | _chelsea1905a |
| Pattern So2: | _2_stripes_white |
| Leftarm2: | FFFFFF |
| Body2: | FFFFFF |
| Rightarm2: | FFFFFF |
| Shorts2: | FFFFFF |
| Socks2: | 0000ff |
| Prevseason: | 1948–49 |
| Nextseason: | 1950–51 |
The 1949–50 season was Chelsea Football Club's thirty-sixth competitive season. The club finished 13th in the First Division for the second consecutive season. They also reached the semi-finals of the FA Cup, where they lost to Arsenal after a replay.