The 1963 Rhineland-Palatinate state election was conducted on 31 March 1963 to elect members to the Landtag, the state legislature of Rhineland-Palatinate, West Germany.|-|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;" | 44.4| style="text-align:right;" | –4.0| style="text-align:right;" | 46| style="text-align:right;" | –6|-| style="background-color: " || style="text-align:left;" | Social Democratic Party| style="text-align:right;" | 40.7| style="text-align:right;" | +5.8| style="text-align:right;" | 43| style="text-align:right;" | +6|-| style="background-color: " || style="text-align:left;" | Free Democratic Party| style="text-align:right;" | 10.1| style="text-align:right;" | +0.4| style="text-align:right;" | 11| style="text-align:right;" | +1|-| style="background-color: " || style="text-align:left;" | Deutsche Reichspartei| style="text-align:right;" | 3.2| style="text-align:right;" | –1.9| style="text-align:right;" | 0| style="text-align:right;" | –1|-| style="background-color: " || style="text-align:left;" | Others| style="text-align:right;" | 1.5| style="text-align:right;" | –0.4| style="text-align:right;" | 0| style="text-align:right;" | ±0|- style="background: #E9E9E9"! style="text-align:left;" colspan=2| Total| 100.0| —| 100| ±0|-| colspan=9 style="text-align:left;" | Source: parties-and-elections.de|}