The 1975 Rhineland-Palatinate state election was conducted on 9 March 1975 to elect members to the Landtag, the state legislature of Rhineland-Palatinate, West Germany.
Ahead of this election, the state electoral reform on 4 July 1972 reduced the constituencies from six to four:
Constituency One (Wahlkreis 1) was centered around Koblenz and elected 26 members. Constituency Two (Wahlkreis 2) was centered around Trier and elected 24 members. Constituency Three (Wahlkreis 3) was centered around Mainz and Ludwigshafen and elected 24 members. Constituency Four (Wahlkreis 4) was centered around Kaiserslautern and elected 26 members.
The seats would be allocated with d'Hondt method. |- |colspan=15| |- ! style="background-color:#E9E9E9;text-align:left;" width=300px colspan=2|Party ! style="background-color:#E9E9E9;text-align:right;" width=50px |Vote # ! style="background-color:#E9E9E9;text-align:right;" width=50px |Vote % ! style="background-color:#E9E9E9;text-align:right;" width=50px |Vote % ± ! style="background-color:#E9E9E9;text-align:right;" width=50px |Seats ! style="background-color:#E9E9E9;text-align:right;" width=50px |Seats ± |- | width=5px style="background-color: " | | style="text-align:left;" | Christian Democratic Union | style="text-align:right;" | 1,143,360 | style="text-align:right;" | 53.9 | style="text-align:right;" | +3.9 | style="text-align:right;" | 55 | style="text-align:right;" | +2 |- | style="background-color: " | | style="text-align:left;" | Social Democratic Party | style="text-align:right;" | 817,018 | style="text-align:right;" | 38.5 | style="text-align:right;" | –2.0 | style="text-align:right;" | 40 | style="text-align:right;" | –4 |- | style="background-color: " | | style="text-align:left;" | Free Democratic Party | style="text-align:right;" | 118,762 | style="text-align:right;" | 5.6 | style="text-align:right;" | –0.3 | style="text-align:right;" | 5 | style="text-align:right;" | +2 |- | style="background-color: " | | style="text-align:left;" | National Democratic Party | style="text-align:right;" | 22,942 | style="text-align:right;" | 1.1 | style="text-align:right;" | –1.6 | style="text-align:right;" | 0 | style="text-align:right;" | ±0 |- | style="background-color: " | | style="text-align:left;" | German Communist Party | style="text-align:right;" | 11,101 | style="text-align:right;" | 0.5 | style="text-align:right;" | –0.4 | style="text-align:right;" | 0 | style="text-align:right;" | ±0
| style="background-color: " | | style="text-align:left;" | Others | style="text-align:right;" | 7,298 | style="text-align:right;" | 0.3 | style="text-align:right;" | N/A | style="text-align:right;" | 0 | style="text-align:right;" | N/A |- style="background: #E9E9E9" ! style="text-align:left;" colspan=2| Total | 2,120,481 | 100.0 | — | 100 | ±0 |- | colspan=9 style="text-align:left;" | Source: parties-and-elections.de |}