| Dennis John | |
| Fullname: | Dennis John |
| Height: | 5 ft 10 in |
| Birth Date: | 27 January 1935 |
| Birth Place: | Swansea, Wales |
| Death Place: | Cardiff |
| Position: | Defender |
| Years1: | 1955–1957 |
| Years2: | 1958–1959 |
| Years3: | 1959–1962 |
| Years4: | 1962–1966 |
| Clubs4: | Millwall |
| Caps1: | 3 |
| Caps2: | 4 |
| Caps3: | 88 |
| Caps4: | 106 |
| Goals1: | 0 |
| Goals2: | 0 |
| Goals3: | 0 |
| Goals4: | 6 |
Dennis John (27 January 1935 – 12 April 2013) was a Welsh professional footballer who played for Plymouth Argyle, Swansea Town, Scunthorpe United and Millwall.[1]
John was part of the Millwall squad that went unbeaten in 59 consecutive league matches at home, a record at the time, from 24 August 1964 until 14 January 1967.[2]