| Dennis Allen | |
| Birth Date: | 2 March 1939 |
| Birth Place: | Romford, England |
| Death Place: | Reading, England |
| Height: | [1] |
| Position: | Inside forward |
| Years1: | 1957–1961 |
| Caps1: | 5 |
| Goals1: | 1 |
| Years2: | 1961–1970 |
| Caps2: | 336 |
| Goals2: | 85 |
| Years3: | 1970–1971 |
| Clubs3: | Bournemouth & Boscombe Athletic |
| Caps3: | 17 |
| Goals3: | 3 |
| Years4: | 1972–1973 |
| Clubs4: | Oostende |
| Caps4: | 29 |
| Goals4: | 1 |
| Years5: | 1974–1979 |
| Clubs5: | Cheltenham Town |
| Manageryears1: | 1974–1979 |
| Managerclubs1: | Cheltenham Town |
| Totalcaps: | 387 |
| Totalgoals: | 90 |
Dennis James Allen (2 March 1939 – 9 July 1995) was an English football player and manager.
Born in Romford, Allen represented Charlton Athletic (1956–1961), Reading (1961–1970) and Bournemouth & Boscombe Athletic (1970–1971) as an inside-forward. He scored 89 goals in 358 league appearances. Dennis went on to be player-manager at Cheltenham Town.[2]
His brother Les (b. 1937), son Martin (b. 1965), grandson Charlie Allen (b. 1992), great-nephew Oliver (b. 1986) and nephews Bradley (b. 1971), Clive (b. 1961) and Paul Allen (b. 1962) all played football professionally. Martin went on to manage Cheltenham Town himself.