The 1951 Rhineland-Palatinate state election was conducted on 29 April 1951 to elect members to the Landtag, the state legislature of Rhineland-Palatinate, West Germany.
Ahead of the election, 7 December 1950 state electoral law divided the state into seven constituencies:
Constituency One (Wahlkreis 1) encompassed the northern part of Koblenz administrative district around Koblenz and returned 18 members. Constituency Two (Wahlkreis 2) encompassed the southern part of Koblenz administrative district around Bad Kreuznach and returned 12 members. Constituency Three (Wahlkreis 3) encompassed the whole Trier administrative district and returned 14 members. Constituency Four (Wahlkreis 4) encompassed the whole Montabaur administrative district and returned 8 members. Constituency Five (Wahlkreis 5) encompassed the whole Rheinhessen administrative district and returned 13 members. Constituency Six (Wahlkreis 6) encompassed the eastern part of Pfalz administrative district around Ludwigshafen and returned 19 members. Constituency Seven (Wahlkreis 7) encompassed the western part of Pfalz administrative district around Kaiserslautern and returned 16 members.
|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 |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;" | 39.2 | style="text-align:right;" | –8.0 | style="text-align:right;" | 43 | style="text-align:right;" | –5 |- | style="background-color: " | | style="text-align:left;" | Social Democratic Party | style="text-align:right;" | 34.0 | style="text-align:right;" | –0.3 | style="text-align:right;" | 38 | style="text-align:right;" | +4 |- | style="background-color: " | | style="text-align:left;" | Free Democratic Party | style="text-align:right;" | 16.9 | style="text-align:right;" | +7.1 | style="text-align:right;" | 19 | style="text-align:right;" | +8 |- | style="background-color: " | | style="text-align:left;" | Communist Party of Germany | style="text-align:right;" | 4.3 | style="text-align:right;" | –4.4 | style="text-align:right;" | 0 | style="text-align:right;" | –8 |- | style="background-color: " | | style="text-align:left;" | Deutsche Reichspartei | style="text-align:right;" | 0.5 | style="text-align:right;" | N/A | style="text-align:right;" | 0 | style="text-align:right;" | N/A |- | style="background-color: " | | style="text-align:left;" | Others | style="text-align:right;" | 5.3 | 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 | 100.0 | — | 100 | –1 |- | colspan=9 style="text-align:left;" | Source: parties-and-elections.de |}