This is a list of Portuguese winter football transfers for the 2013–14 season.
The winter transfer window opened on 2 January 2014 and closed at 6:00 pm on 31 January 2014.
[1] Players could be bought before the transfer window opened, but were not permitted to join their new clubs until 2 January.
Additionally, players without a club could join at any time and clubs were able to sign a goalkeeper on an emergency loan if they had no registered goalkeeper available.
Only moves involving Primeira Liga clubs are listed; included are clubs that completed transfers after the closing of the summer 2013 transfer window due to other domestic leagues having a later closure date to their transfer window.