# 1966 Colombian parliamentary election

Parliamentary elections were held in Colombia on 20 March 1966 to elect the Senate and Chamber of Representatives. Under the National Front agreement, only the Conservative Party and the Liberal Party were allowed to contest the elections, with each party allocated 50% of the seats in both houses. As a result, the main contest at the elections was between factions within each party.

## Results
### Senate

| Party and faction | Party and faction | Party and faction | Party and faction | Votes | % | Seats | +/– |
| | Colombian Liberal Party | | Oficialistas | 1,120,394 | 38.51 | 46 | +9 |
| | Colombian Liberal Party | | Liberal Revolutionary Movement (soft) | 367,457 | 12.63 | 7 | – |
| | Colombian Liberal Party | | National Popular Alliance | 10,283 | 0.35 | 0 | – |
| | Colombian Liberal Party | | Others | 347 | 0.01 | 0 | – |
| | Colombian Liberal Party | | Independents | 31,009 | 1.07 | 0 | – |
| | Colombian Liberal Party | Total | Total | 1,529,490 | 52.57 | 53 | +4 |
| | Colombian Conservative Party | | National Popular Alliance | 474,489 | 16.31 | 18 | +16 |
| | Colombian Conservative Party | | Unionistas | 472,876 | 16.25 | 20 | –11 |
| | Colombian Conservative Party | | Lauro-Alzatistas | 339,809 | 11.68 | 14 | New |
| | Colombian Conservative Party | | Leyvistas | 6,984 | 0.24 | 0 | – |
| | Colombian Conservative Party | | Others | 3,960 | 0.14 | 0 | – |
| | Colombian Conservative Party | | Independents | 81,586 | 2.80 | 1 | +1 |
| | Colombian Conservative Party | Total | Total | 1,379,704 | 47.43 | 53 | +4 |
| Total | Total | Total | Total | 2,909,194 | 100.00 | 106 | +8 |
| Valid votes | Valid votes | Valid votes | Valid votes | 2,909,194 | 99.70 | | |
| Invalid/blank votes | Invalid/blank votes | Invalid/blank votes | Invalid/blank votes | 8,669 | 0.30 | | |
| Total votes | Total votes | Total votes | Total votes | 2,917,863 | 100.00 | | |
| Registered voters/turnout | Registered voters/turnout | Registered voters/turnout | Registered voters/turnout | 6,609,639 | 44.15 | | |
| Source: Nohlen ||||||||

### Chamber of Representatives

| Party and faction | Party and faction | Party and faction | Party and faction | Votes | % | Seats | +/– |
| | Colombian Liberal Party | | Oficialistas | 1,120,824 | 38.26 | 69 | +10 |
| | Colombian Liberal Party | | Liberal Revolutionary Movement (soft) | 369,956 | 12.63 | 21 | –2 |
| | Colombian Liberal Party | | National Popular Alliance | 100,898 | 3.44 | 4 | +3 |
| | Colombian Liberal Party | | Others | 14,940 | 0.51 | 0 | – |
| | Colombian Liberal Party | | Independents | 24,026 | 0.82 | 1 | +1 |
| | Colombian Liberal Party | Total | Total | 1,630,644 | 55.67 | 95 | +3 |
| | Colombian Conservative Party | | Unionistas | 474,397 | 16.20 | 35 | – |
| | Colombian Conservative Party | | National Popular Alliance | 422,204 | 14.41 | 33 | +7 |
| | Colombian Conservative Party | | Lauro-Alzatistas | 346,664 | 11.83 | 25 | New |
| | Colombian Conservative Party | | Leyvistas | 7,485 | 0.26 | 1 | +1 |
| | Colombian Conservative Party | | Others | 7,771 | 0.27 | 0 | – |
| | Colombian Conservative Party | | Independents | 40,106 | 1.37 | 1 | +1 |
| | Colombian Conservative Party | Total | Total | 1,298,627 | 44.33 | 95 | +3 |
| Total | Total | Total | Total | 2,929,271 | 100.00 | 190 | +6 |
| Valid votes | Valid votes | Valid votes | Valid votes | 2,929,271 | 99.66 | | |
| Invalid/blank votes | Invalid/blank votes | Invalid/blank votes | Invalid/blank votes | 9,951 | 0.34 | | |
| Total votes | Total votes | Total votes | Total votes | 2,939,222 | 100.00 | | |
| Registered voters/turnout | Registered voters/turnout | Registered voters/turnout | Registered voters/turnout | 6,609,639 | 44.47 | | |
| Source: Nohlen ||||||||