| Club: | Chelsea |
| Season: | 1912–13 |
| Manager: | David Calderhead |
| Chairman: | Claude Kirby |
| Owner: | Gus Mears |
| Stadium: | Stamford Bridge |
| League: | Second Division |
| League Result: | 18th |
| Cup1: | FA Cup |
| Cup1 Result: | Second Round |
| League Topscorer: | Vivian Woodward (10) |
| Season Topscorer: | Bob Whittingham (12) |
| Largest Win: | 5–2 v Southend United 5–2 v Notts County |
| Largest Loss: | 0–6 v The Wednesday |
| 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: | 1911–12 |
| Nextseason: | 1913–14 |
The 1912–13 season was Chelsea Football Club's eighth competitive season The club finished 18th in the First Division, narrowly avoiding relegation.