The Free Democratic Party (German: Freie Demokratische Partei, FDP, German pronunciation: [ɛfdeːˈpeː] ^ⓘ) is a liberal political party in Germany. The FDP was founded in 1948 by members of former liberal political parties in Germany before World War II, namely the German Democratic Party and the German People's Party. For most of the second half of the 20th century, particularly from 1961 to 1982, the FDP held the balance of power in the Bundestag. It has been a junior coalition partner to both the CDU/CSU (1949–1956, 1961–1966, 1982–1998, and 2009–2013) and Social Democratic Party (SPD; 1969–1982 and 2021–2024).

In the 2013 federal election, the FDP failed to win any directly elected seats in the Bundestag and came up short of the 5 percent threshold to qualify for list representation, being left without representation in the Bundestag for the first time in its history. In the 2017 federal election, the FDP regained its representation in the Bundestag, receiving 10.6% of the vote. From the 2021 federal election to the 2024 German government crisis, the FDP was part of governing Scholz cabinet in a "traffic light coalition" with the SPD and the Greens. In the 2025 federal election, the party again failed to win any directly elected seats and came up short of the 5 percent threshold to qualify for list representation, leaving the party with no seats in the Bundestag.

Apart from a brief progressive and social liberal period in the 1970s (Freiburger Thesen), the FDP has traditionally been located in the centre-right of the political spectrum. Since the 1980s, the party, consistently with its ordoliberal tradition, has pushed economic liberalism and has aligned itself closely to the promotion of free markets and privatization. The FDP is a member of the Liberal International, the Alliance of Liberals and Democrats for Europe, and Renew Europe.

The history of liberal parties in Germany dates back to 1861, when the German Progress Party (DFP) was founded, being the first political party in the modern sense in Germany. From the establishment of the National Liberal Party in 1867 until the demise of the Weimar Republic in 1933, the liberal-democratic camp was divided into a national-liberal and a left-liberal line of tradition. After 1918, the national-liberal strain was represented by the German People's Party (DVP), the left-liberal one by the German Democratic Party (DDP, which merged into the German State Party in 1930). Both parties played an important role in government during the Weimar Republic era, but successively lost votes during the rise of the Nazi Party beginning in the late-1920s. After the Nazi seizure of power, both liberal parties agreed to the Enabling Act of 1933 and subsequently dissolved themselves. During the 12 years of Hitler's rule, some former liberals collaborated with the Nazis (e.g. economy minister Hjalmar Schacht), while others resisted actively against Nazism, with some Liberal leaning members and former members of the military joining up with Henning von Tresckow (e.g. the Solf Circle).

Soon after World War II, the Soviet Union pushed for the creation of licensed anti-fascist parties in its occupation zone in East Germany. In July 1945, former DDP politicians Wilhelm Külz, Eugen Schiffer, and Waldemar Koch called for the establishment of a pan-German liberal party. Their Liberal-Democratic Party (LDP) was soon licensed by the Soviet Military Administration in Germany, under the condition that the new party joined the pro-Soviet Democratic Bloc.

In September 1945, citizens in Hamburg—including the anti-Nazi resistance circle Association Free Hamburg—established the Party of Free Democrats (PFD) as a bourgeois left-wing party and the first liberal Party in the Western occupation zones. The German Democratic Party was revived in some states of the Western occupation zones (in the Southwestern states of Württemberg-Baden and Württemberg-Hohenzollern under the name of Democratic People's Party).

Many former members of DDP and DVP however agreed to finally overcome the traditional split of German liberalism into a national-liberal and a left-liberal branch, aiming for the creation of a united liberal party. In October 1945 a liberal coalition party was founded in the state of Bremen under the name of Bremen Democratic People's Party. In January 1946, liberal state parties of the British occupation zone merged into the Free Democratic Party of the British Zone (FDP). A similar state party in Hesse, called the Liberal Democratic Party, was licensed by the U.S. military government in January 1946. In the state of Bavaria, a Free Democratic Party was founded in May 1946.

In the first post-war state elections in 1946, liberal parties performed well in Württemberg-Baden (16.8%), Bremen (18.3%), Hamburg (18.2%) and Greater Berlin (still undivided; 9.3%). The LDP was especially strong in the October 1946 state elections of the Soviet zone—the last free parliamentary election in East Germany—obtaining an average of 24.6% (highest in Saxony-Anhalt, 29.9%, and Thuringia, 28.5%), thwarting an absolute majority of the Socialist Unity Party of Germany (SED) that was favoured by the Soviet occupation power. This disappointment to the Communists led to a change of electoral laws in the Soviet zone, cutting the autonomy of non-socialist parties including the LDP and forcing it to join the SED-dominated National Front, making it a dependent bloc party.