Every Leyton Orient season on record, from 1905–06 to 2026–27 — league record, finishing position and leading scorer. Click a season for every match it contained.
| Season | Division | P | W | D | L | GF | GA | Pos | Leading scorer |
|---|---|---|---|---|---|---|---|---|---|
| 1905–06 | Second Division | 40 | 7 | 8 | 25 | 35 | 81 | 20 | |
| 1906–07 | Second Division | 38 | 11 | 8 | 19 | 45 | 67 | 17 | |
| 1907–08 | Second Division | 38 | 11 | 10 | 17 | 40 | 65 | 14 | |
| 1908–09 | Second Division | 39 | 12 | 9 | 18 | 37 | 54 | 15 | |
| 1909–10 | Second Division | 39 | 12 | 6 | 21 | 37 | 62 | 16 | |
| 1910–11 | Second Division | 39 | 19 | 7 | 13 | 45 | 37 | 4 | |
| 1911–12 | Second Division | 39 | 21 | 3 | 15 | 62 | 46 | 4 | W |
| 1912–13 | Second Division | 39 | 10 | 14 | 15 | 34 | 53 | 14 | |
| 1913–14 | Second Division | 41 | 17 | 12 | 12 | 51 | 40 | 6 | |
| 1914–15 | Second Division | 39 | 16 | 9 | 14 | 51 | 50 | 9 | |
| 1919–20 | Second Division | 43 | 16 | 6 | 21 | 52 | 63 | 15 | |
| 1920–21 | Second Division | 43 | 16 | 13 | 14 | 43 | 43 | 7 | R/U |
| 1921–22 | Second Division | 43 | 15 | 9 | 19 | 43 | 52 | 15 | |
| 1922–23 | Second Division | 43 | 12 | 12 | 19 | 40 | 52 | 19 | |
| 1923–24 | Second Division | 45 | 14 | 17 | 14 | 43 | 40 | 10 | |
| 1924–25 | Second Division | 43 | 14 | 12 | 17 | 42 | 43 | 11 | R/U |
| 1925–26 | Second Division | 46 | 15 | 9 | 22 | 58 | 73 | 20 | |
| 1926–27 | Second Division | 44 | 12 | 8 | 24 | 62 | 102 | 20 | R/U |
| 1927–28 | Second Division | 43 | 11 | 12 | 20 | 56 | 87 | 20 | |
| 1928–29 | Second Division | 46 | 13 | 10 | 23 | 47 | 81 | 22 | |
| 1929–30 | Third Division South | 48 | 17 | 15 | 16 | 65 | 68 | 12 | |
| 1930–31 | Third Division South | 44 | 14 | 8 | 22 | 67 | 97 | 19 | |
| 1931–32 | Third Division South | 45 | 13 | 12 | 20 | 81 | 96 | 16 | |
| 1932–33 | Third Division South | 43 | 8 | 13 | 22 | 59 | 94 | 20 | |
| 1933–34 | Third Division South | 46 | 18 | 11 | 17 | 81 | 72 | 11 | R2 |
| 1934–35 | Third Division South | 44 | 16 | 10 | 18 | 70 | 69 | 14 | R1 |
| 1935–36 | Third Division South | 47 | 19 | 7 | 21 | 61 | 65 | 14 | R1 |
| 1936–37 | Third Division South | 44 | 15 | 15 | 14 | 55 | 57 | 12 | R3 |
| 1937–38 | Third Division South | 45 | 14 | 8 | 23 | 46 | 65 | 19 | R1 |
| 1938–39 | Third Division South | 44 | 12 | 13 | 19 | 58 | 60 | 20 | R2 |
| 1945–46 | Third Division South | 2 | 1 | 0 | 1 | 2 | 3 | 8 | |
| 1946–47 | Third Division South | 43 | 12 | 8 | 23 | 55 | 77 | 19 | |
| 1947–48 | Third Division South | 43 | 13 | 10 | 20 | 51 | 74 | 17 | |
| 1948–49 | Third Division South | 44 | 12 | 12 | 20 | 61 | 83 | 19 | |
| 1949–50 | Third Division South | 43 | 12 | 11 | 20 | 53 | 87 | 18 | |
| 1950–51 | Third Division South | 47 | 15 | 8 | 24 | 54 | 77 | 19 | |
| 1951–52 | Third Division South | 55 | 20 | 13 | 22 | 70 | 81 | 18 | |
| 1952–53 | Third Division South | 48 | 16 | 11 | 21 | 69 | 75 | 14 | |
| 1953–54 | Third Division South | 53 | 23 | 12 | 18 | 97 | 79 | 11 | |
| 1954–55 | Third Division South | 48 | 27 | 9 | 12 | 92 | 48 | 2 | |
| 1955–56 | Third Division South | 50 | 32 | 8 | 10 | 118 | 55 | 1 | R2 |
| 1956–57 | Second Division | 43 | 15 | 10 | 18 | 66 | 86 | 15 | R1 |
| 1957–58 | Second Division | 44 | 19 | 5 | 20 | 79 | 83 | 12 | R1 |
| 1958–59 | Second Division | 43 | 14 | 8 | 21 | 73 | 82 | 17 | R1 |
| 1959–60 | Second Division | 43 | 15 | 14 | 14 | 77 | 63 | 10 | R3 |
| 1960–61 | Second Division | 48 | 17 | 9 | 22 | 65 | 85 | 19 | |
| 1961–62 | Second Division | 49 | 24 | 13 | 12 | 76 | 50 | 2 | |
| 1962–63 | First Division | 51 | 11 | 11 | 29 | 60 | 92 | 22 | |
| 1963–64 | Second Division | 46 | 14 | 11 | 21 | 59 | 80 | 16 | |
| 1964–65 | Second Division | 45 | 13 | 11 | 21 | 55 | 77 | 19 | |
| 1965–66 | Second Division | 44 | 5 | 13 | 26 | 39 | 86 | 22 | |
| 1966–67 | Third Division | 50 | 14 | 19 | 17 | 61 | 73 | 14 | |
| 1967–68 | Third Division | 52 | 15 | 18 | 19 | 53 | 70 | 19 | |
| 1968–69 | Third Division | 52 | 16 | 16 | 20 | 59 | 64 | 18 | |
| 1969–70 | Third Division | 50 | 25 | 14 | 11 | 68 | 41 | 1 | |
| 1970–71 | Second Division | 46 | 10 | 17 | 19 | 33 | 54 | 17 | |
| 1971–72 | Second Division | 48 | 17 | 10 | 21 | 60 | 68 | 17 | W |
| 1972–73 | Second Division | 45 | 13 | 12 | 20 | 53 | 59 | 15 | W |
| 1973–74 | Second Division | 50 | 18 | 21 | 11 | 64 | 50 | 4 | |
| 1974–75 | Second Division | 46 | 11 | 22 | 13 | 32 | 47 | 12 | R1 |
| 1975–76 | Second Division | 44 | 13 | 14 | 17 | 37 | 44 | 13 | |
| 1976–77 | Second Division | 50 | 11 | 20 | 19 | 43 | 63 | 19 | R/U |
| 1977–78 | Second Division | 53 | 15 | 21 | 17 | 56 | 61 | 14 | R1 |
| 1978–79 | Second Division | 46 | 16 | 11 | 19 | 55 | 57 | 11 | R1 |
| 1979–80 | Second Division | 47 | 13 | 20 | 14 | 57 | 63 | 14 | |
| 1980–81 | Second Division | 45 | 13 | 12 | 20 | 54 | 63 | 17 | R1 |
| 1981–82 | Second Division | 49 | 12 | 12 | 25 | 43 | 67 | 22 | R1 |
| 1982–83 | Third Division | 50 | 17 | 9 | 24 | 70 | 93 | 20 | R1 |
| 1983–84 | Third Division | 49 | 18 | 10 | 21 | 76 | 89 | 11 | R1 |
| 1984–85 | Third Division | 54 | 15 | 14 | 25 | 62 | 87 | 22 | SthSF |
| 1985–86 | Fourth Division | 56 | 25 | 15 | 16 | 99 | 84 | 5 | R2 |
| 1986–87 | Fourth Division | 52 | 22 | 11 | 19 | 70 | 69 | 7 | PR |
| 1987–88 | Fourth Division | 52 | 22 | 13 | 17 | 93 | 68 | 8 | R1 |
| 1988–89 | Fourth Division | 58 | 25 | 16 | 17 | 98 | 61 | 6 | PR |
| 1989–90 | Third Division | 51 | 18 | 11 | 22 | 61 | 62 | 14 | PRP/O |
| 1990–91 | Third Division | 57 | 22 | 15 | 20 | 72 | 69 | 13 | PR |
| 1991–92 | Third Division | 55 | 22 | 13 | 20 | 77 | 65 | 10 | SthSF |
| 1992–93 | Second Division | 50 | 22 | 10 | 18 | 76 | 65 | 7 | SthQF |
| 1993–94 | Second Division | 51 | 15 | 16 | 20 | 61 | 77 | 18 | SthSF |
| 1994–95 | Second Division | 50 | 7 | 9 | 34 | 34 | 83 | 24 | SthF |
| 1995–96 | Third Division | 49 | 13 | 11 | 25 | 46 | 67 | 21 | R1 |
| 1996–97 | Third Division | 50 | 17 | 12 | 21 | 54 | 63 | 16 | R1 |
| 1997–98 | Third Division | 52 | 20 | 15 | 17 | 73 | 59 | 11 | R2 |
| 1998–99 | Third Division | 58 | 23 | 20 | 15 | 80 | 73 | 6 | R1 |
| 1999–00 | Third Division | 52 | 15 | 15 | 22 | 53 | 61 | 19 | R1 |
| 2000–01 | Third Division | 57 | 24 | 18 | 15 | 75 | 66 | 5 | R2 |
| 2001–02 | Third Division | 51 | 16 | 13 | 22 | 65 | 81 | 18 | R1 |
| 2002–03 | Third Division | 49 | 15 | 12 | 22 | 57 | 67 | 18 | R2 |
| 2003–04 | Third Division | 49 | 14 | 14 | 21 | 52 | 73 | 19 | R1 |
| 2004–05 | League Two | 49 | 17 | 15 | 17 | 69 | 75 | 11 | SthSF |
| 2005–06 | League Two | 52 | 25 | 16 | 11 | 74 | 58 | 3 | R2 |
| 2006–07 | League One | 50 | 13 | 16 | 21 | 65 | 84 | 20 | R2 |
| 2007–08 | League One | 52 | 18 | 14 | 20 | 56 | 70 | 14 | R2 |
| 2008–09 | League One | 51 | 18 | 11 | 22 | 54 | 68 | 14 | R2 |
| 2009–10 | League One | 52 | 15 | 15 | 22 | 58 | 67 | 17 | SthQF |
| 2010–11 | League One | 58 | 25 | 17 | 16 | 92 | 78 | 7 | R2 |
| 2011–12 | League One | 52 | 15 | 13 | 24 | 58 | 83 | 20 | R1 |
| 2012–13 | League One | 57 | 26 | 11 | 20 | 71 | 62 | 7 | SthF |
| 2013–14 | League One | 57 | 30 | 14 | 13 | 104 | 62 | 3 | SthQF |
| 2014–15 | League One | 54 | 16 | 14 | 24 | 70 | 77 | 23 | SthSF |
| 2015–16 | League Two | 51 | 20 | 13 | 18 | 68 | 69 | 8 | R1 |
| 2016–17 | League Two | 51 | 11 | 6 | 34 | 52 | 99 | 24 | R1 |
| 2017–18 | National League | 1 | 0 | 0 | 1 | 1 | 2 | 13 | R4 |
| 2019–20 | League Two | 42 | 11 | 14 | 17 | 52 | 64 | 17 | R2 |
| 2020–21 | League Two | 53 | 21 | 10 | 22 | 66 | 67 | 11 | R2 (75) |
| 2021–22 | League Two | 54 | 19 | 18 | 17 | 74 | 50 | 13 | R2 |
| 2022–23 | League Two | 51 | 27 | 13 | 11 | 66 | 46 | 1 | R1 |
| 2023–24 | League One | 52 | 19 | 12 | 21 | 60 | 65 | 11 | R1 |
| 2024–25 | League One | 61 | 29 | 11 | 21 | 94 | 67 | 6 | R3 |
| 2025–26 | 53 | 18 | 10 | 25 | 66 | 79 | |||
| 2026–27 | 5 | 2 | 2 | 1 | 6 | 3 |