| Election Name: | 1965 Japanese House of Councillors election |
| Country: | Japan |
| Flag Year: | 1870 |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | 1962 Japanese House of Councillors election |
| Previous Year: | 1962 |
| Next Election: | 1968 Japanese House of Councillors election |
| Next Year: | 1968 |
| Seats For Election: | 127 of the 251 seats in the House of Councillors |
| Majority Seats: | 126 |
| Election Date: | 4 July 1965 |
| Image1: | Sato Eisaku 1-1.jpg |
| Leader1: | Eisaku Satō |
| Party1: | Liberal Democratic Party (Japan) |
| Seats After1: | 140 |
| Seat Change1: | 2 |
| Popular Vote1: | 17,583,490 |
| Percentage1: | 47.2% |
| Swing1: | 0.8% |
| Leader2: | Kōzō Sasaki |
| Party2: | Japan Socialist Party |
| Seats After2: | 73 |
| Seat Change2: | 6 |
| Popular Vote2: | 8,729,655 |
| Percentage2: | 23.4% |
| Swing2: | 0.8% |
| Image3: | Takehisa-Tsuji-1.png |
| Leader3: | Takehisa Tsuji |
| Party3: | Kōmeitō (1962–1998) |
| Seats After3: | 20 |
| Seat Change3: | 5 |
| Popular Vote3: | 5,097,682 |
| Percentage3: | 13.7% |
| Swing3: | 2.2% |
| Image4: | NISHIO Suehiro.jpg |
| Leader4: | Suehiro Nishio |
| Party4: | Democratic Socialist Party (Japan) |
| Seats After4: | 7 |
| Seat Change4: | 4 |
| Popular Vote4: | 2,214,375 |
| Percentage4: | 5.9% |
| Swing4: | 0.6% |
| Image5: | The-Zenei-1962-December-Special-1.png |
| Leader5: | Kenji Miyamoto |
| Party5: | Japanese Communist Party |
| Seats After5: | 4 |
| Popular Vote5: | 1,652,364 |
| Percentage5: | 4.4% |
| Swing5: | 1.3% |
| President of the House of Councillors | |
| Posttitle: | President of the House of Councillors-designate |
| Before Election: | Yōtoku Shigemasa |
| Before Party: | Liberal Democratic Party (Japan) |
| After Election: | Kenzō Kōno |
| After Party: | Liberal Democratic Party (Japan) |
House of Councillors elections were held in Japan on 4 July 1965,[1] electing half the seats in the House. The Liberal Democratic Party won the most seats.
| Constituency | Total seats | Seats won | ||||||
|---|---|---|---|---|---|---|---|---|
| LDP | JSP | Kōmeitō | DSP | JCP | Ind. | |||
| Aichi | 3 | 2 | 1 | |||||
| Akita | 1 | 1 | ||||||
| Aomori | 1 | 1 | ||||||
| Chiba | 2 | 1 | 1 | |||||
| Ehime | 1 | 1 | ||||||
| Fukui | 1 | 1 | ||||||
| Fukuoka | 3 | 2 | 1 | |||||
| Fukushima | 2 | 1 | 1 | |||||
| Gifu | 1 | 1 | ||||||
| Gunma | 2 | 1 | 1 | |||||
| Hiroshima | 2 | 1 | 1 | |||||
| Hokkaido | 4 | 2 | 2 | |||||
| Hyōgo | 3 | 1 | 1 | 1 | ||||
| Ibaraki | 2 | 1 | 1 | |||||
| Ishikawa | 1 | 1 | ||||||
| Iwate | 1 | 1 | ||||||
| Kagawa | 1 | 1 | ||||||
| Kagoshima | 2 | 2 | ||||||
| Kanagawa | 2 | 1 | 1 | |||||
| Kōchi | 1 | 1 | ||||||
| Kumamoto | 2 | 1 | 1 | |||||
| Kyoto | 2 | 1 | 1 | |||||
| Mie | 1 | 1 | ||||||
| Miyagi | 1 | 1 | ||||||
| Miyazaki | 1 | 1 | ||||||
| Nagano | 2 | 1 | 1 | |||||
| Nagasaki | 1 | 1 | ||||||
| Nara | 1 | 1 | ||||||
| Niigata | 2 | 1 | 1 | |||||
| Ōita | 1 | 1 | ||||||
| Okayama | 2 | 1 | 1 | |||||
| Osaka | 3 | 1 | 1 | 1 | ||||
| Saga | 1 | 1 | ||||||
| Saitama | 2 | 1 | 1 | |||||
| Shiga | 1 | 1 | ||||||
| Shimane | 1 | 1 | ||||||
| Shizuoka | 2 | 1 | 1 | |||||
| Tochigi | 2 | 2 | ||||||
| Tokushima | 1 | 1 | ||||||
| Tokyo | 4 | 1 | 1 | 1 | 1 | |||
| Tottori | 1 | 1 | ||||||
| Toyama | 1 | 1 | ||||||
| Wakayama | 1 | 1 | ||||||
| Yamagata | 1 | 1 | ||||||
| Yamaguchi | 1 | 1 | ||||||
| Yamanashi | 1 | 1 | ||||||
| National | 52 | 25 | 12 | 9 | 2 | 2 | 2 | |
| Total | 127 | 71 | 36 | 11 | 3 | 3 | 3 | |