| Club: | Chelsea |
| Season: | 1911–12 |
| Manager: | David Calderhead |
| Chairman: | Claude Kirby |
| Owner: | Gus Mears |
| Stadium: | Stamford Bridge |
| League: | Second Division |
| League Result: | 2nd |
| Cup1: | FA Cup |
| Cup1 Result: | Second Round |
| League Topscorer: | Bob Whittingham (26) |
| Season Topscorer: | Bob Whittingham (26) |
| Largest Win: | 4–0 v Wolverhampton Wanderers |
| Largest Loss: | 1–3 v Wolverhampton Wanderers |
| 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: | 1910–11 |
| Nextseason: | 1912–13 |
The 1911–12 season was Chelsea Football Club's seventh competitive season and seventh year in existence. The club finished 2nd in the Second Division and gained promotion back to the First Division.