List of Portuguese football transfers winter 2018–19

This is a list of Portuguese football transfers for the 2018–19 winter transfer window. The winter transfer window opened 1 January 2019, although a few transfers may take place prior to that date. The window closed at midnight on 1 February 2019, although outgoing transfers could have still happened to leagues in which the window is still open. Only moves involving Primeira Liga clubs are listed. Additionally, players without a club may join a club at any time.