Convocation sejm (Polish: sejm konwokacyjny) was a special sejm in pre-partition Poland that, upon vacancy of the throne, was summoned to Warsaw by the primate of the Roman Catholic Church in Poland, acting as interrex.

The convocation sejm fixed the date for the election sejm that would elect a new king, restated the rules, reviewed the candidacies, and set the terms on which the king-elect would be permitted to take the throne.

The convocation sejm was followed by the election sejm, meeting at Wola, outside Warsaw.

See also:

• Free election