| Election Name: | 1864 Portuguese legislative election |
| Country: | Portugal |
| Flag Year: | 1830 |
| Type: | Parliamentary |
| Previous Election: | 1861 Portuguese legislative election |
| Previous Year: | 1861 |
| Next Election: | 1865 Portuguese legislative election |
| Next Year: | 1865 |
| Majority Seats: | 89 |
| Election Date: | 11 September 1864 |
| Colour2: | 0070C0 |
| Leader Since2: | 1856 |
| Last Election2: | 40 seats |
| Seats2: | 32 |
| Seats After2: | 8 |
| Percentage2: | 18% |
| Swing2: | 4% |
| Colour1: | 800000 |
| Leader Since1: | 1852 |
| Last Election1: | 137 seats |
| Seats1: | 145 |
| Seats After1: | 8 |
| Percentage1: | 82% |
| Swing1: | 4% |
| Posttitle: | Prime Minister after election |
| After Party: | Historic |
Parliamentary elections were held in Portugal on 11 September 1864.
| Party | Votes | % | Seats |
|---|---|---|---|
| Historic Party | 82.0% | 145 | |
| Regenerator Party | 18.0% | 32 | |
| Total | 238,462 | 100.0% | 177 |
| Registered voters/turnout | 350,145 | 68.1% | – |
| align=left colspan=4 | Source: ISCSP, Nohlen & Stöver[1] | ||