The Fourth Merkel cabinet was the 23rd Government of the Federal Republic of Germany during the 19th legislative session of the Bundestag. It was sworn in on 14 March 2018 following the 2017 federal election and dismissed on 26 October 2021, acting in a caretaker mode until 8 December 2021. It was preceded by the third Merkel cabinet and succeeded by the Scholz cabinet. Led by Chancellor Angela Merkel, it was the third cabinet under Merkel to be supported by a coalition of the Christian Democratic Union (CDU), the Christian Social Union of Bavaria (CSU), and the Social Democratic Party (SPD).

The vice-chancellor of Germany, unofficially the vice-chancellor of the Federal Republic of Germany, officially the deputy to the federal chancellor, is the second highest ranking German cabinet member. The chancellor is the head of government and, according to the constitution, gives this title of deputy to one of the federal ministers. It is common that the title is given to the major minister provided by the (smaller) coalition partner.