| P | # | Player | Born | Height | Weight | Contract | |
|---|---|---|---|---|---|---|---|
| GK | Glenn Morris | 1983-12-20 | 183 | 70 | |||
| D | Adam Chambers | 1980-11-20 | 178 | 74 | |||
| D | Benjamin Chorley | 1982-09-30 | 188 | 83 | |||
| D | Charlie Daniels | 1986-09-17 | 178 | 75 | 2020-06-30 | ||
| D | Eric Lichaj | 1988-11-17 | 180 | 79 | 2015 Jun | ||
| D | Jason Demetriou | 1987-11-18 | |||||
| D | Luke Ashworth | 1989-12-04 | |||||
| D | Matthew Briggs | 1991-03-09 | 184 | 76 | |||
| D | Stephen Purches | 1980-01-14 | 180 | 74 | |||
| D | Tamika Mkandawire | 1983-05-28 | 183 | 78 | |||
| M | Andros Townsend | 1991-07-16 | 182 | 76 | 2021-06-30 | ||
| M | Jimmy Smith | 1987-01-07 | 184 | 81 | |||
| M | John Melligan | 1982-02-11 | |||||
| M | Sean Thornton | 1983-05-18 | |||||
| F | Adrian Patulea | 1984-10-10 | 178 | 78 | 2011 | ||
| F | James Scowcrofth | 1975-11-15 | |||||
| F | Loick Pires | 1989-11-20 | |||||
| F | Ryan Jarvis | 1986-07-11 | 185 | 72 | 2012 | ||
| F | Scott McGleish | 1974-02-10 | 175 | 73 |
| Date | Player | From | To | Status | Src |
|---|---|---|---|---|---|
| 30.Jun | Peter Ramage (D) | Leyton Orient | Coventry City | Confirmed | |
| 22.Apr | Bradley Pritchard (M) | Stevenage Borough FC | Leyton Orient | Confirmed | |
| 24.Mar | Connor Essam (D) | Leyton Orient | Dover Athletic FC | Confirmed | |
| 23.Mar | Bradley Pritchard (M) | Leyton Orient | Stevenage Borough FC | Confirmed | |
| 18.Mar | Peter Ramage (D) | Coventry City | Leyton Orient | Confirmed | |
| 21.Jan | Kevin Nolan (M) | West Ham United | Leyton Orient | Confirmed | |
| 8.Jul | Romain Vincelot (M) | Leyton Orient | Coventry City | Confirmed | |
| 2.Feb | Alex Cisak (GK) | Burnley FC | Leyton Orient | Confirmed | |
| 6.Nov | Andrea Dossena (M) | Sunderland AFC | Leyton Orient | Confirmed | |
| 3.Jan | Jamie Ness (M) | Stoke City | Leyton Orient | Confirmed |