| Club: | Chelsea |
| Season: | 1948–49 |
| Manager: | Billy Birrell |
| Chairman: | Joe Mears |
| Stadium: | Stamford Bridge |
| League: | First Division |
| League Result: | 13th |
| Cup1: | FA Cup |
| Cup1 Result: | Fifth round |
| League Topscorer: | Roy Bentley (20) |
| Season Topscorer: | Roy Bentley (22) |
| Largest Win: | 6–0 v Everton |
| Largest Loss: | 2–5 v Portsmouth |
| 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: | 1947–48 |
| Nextseason: | 1949–50 |
The 1948–49 season was Chelsea Football Club's thirty-fifth competitive season. Chelsea finished 13th in the First Division and reached the fifth round of the FA Cup. The season also saw the arrival of Roy Bentley, who would become, at the time, the club's leading goalscorer.