Federal elections were held in Germany on 18 September 2005 to elect the members of the 16th Bundestag. The snap election was called after the government's defeat in the North Rhine-Westphalia state election, which caused them to intentionally lose a motion of confidence to trigger an early federal election. The outgoing government was a coalition of the centre-left Social Democratic Party of Germany (SPD) and Alliance 90/The Greens, led by federal Chancellor Gerhard Schröder. The election was originally intended for the autumn of 2006.

A coalition government, or coalition cabinet, is a government where political parties enter a power-sharing arrangement of the executive. Coalition governments usually occur when no single party has achieved an absolute majority after an election. A party not having majority is common under proportional representation, but not in nations with majoritarian electoral systems.