The Rhineland-Palatinate Landtag is the state diet of the German federal state of Rhineland-Palatinate.
Article 79, Section 1 of the Rhineland-Palatinate constitution provides: "The Landtag is the supreme organ of political decision-making, elected by the people. It represents the people, elects the Minister-President and confirms the cabinet, passes the laws and the budget, controls the executive and enunciates the popular will in the conduct of public affairs, in questions of European policy and according to the agreements between the Landtag and the cabinet."
The Landtag consists of 101 members.
The Landtag convenes in the Deutschhaus building, where also the first democratically elected parliament German history had convened, the Rhenish-German national convention of the Mainz Republic.
The German flag used in the Landtag is a historical one used during the Hambacher Fest.
After the elections of March 27, 2011, the composition of the Landtag is as follows:
| Party | Seats |
|---|---|
| Social Democratic Party (SPD) | 42 |
| Christian Democratic Union (CDU) | 41 |
| Alliance '90/The Greens | 18 |
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