There are three types of national elections in Poland which are:
Presidential: occurs every 5 years. The first election was held in 1946 and the last one was in 2020.
Parliamentary: occurs every 4 years. The first election was held in 1946 and the last one was in 2022.
Senate: occurs every 4 years. The first election was held in 1946 and the last one was in 2020.