| Country: | Mongolian People's Republic |
| Previous Election: | 1963 |
| Next Election: | 1969 |
| Election Date: | 26 June 1966 |
| Seats For Election: | All 287 seats in the State Great Khural |
| Majority Seats: | 144 |
| Nopercentage: | yes |
| Party1: | MPRP |
| Leader1: | Yumjaagiin Tsedenbal |
| Seats1: | 234 |
| Last Election1: | 216 |
| Party2: | Non-party members |
| Party2 Link: | no |
| Leader2: | – |
| Seats2: | 53 |
| Last Election2: | 54 |
| Chairmen of the Council of Ministers | |
| Before Election: | Yumjaagiin Tsedenbal |
| Before Party: | MPRP |
| After Election: | Yumjaagiin Tsedenbal |
| After Party: | MPRP |
Parliamentary elections were held in Mongolia on 26 June 1966.[1] At the time, the country was a one-party state under the rule of the Mongolian People's Revolutionary Party. The MPRP won 234 of the 287 seats, with the remaining 53 seats going to non-party candidates, who had been chosen by the MPRP due to their social status.[2] Voter turnout was reported to be 100%, with only 14 registered voters failing to cast a ballot.