2018–19 in Portuguese futsal

Campeonato Nacional da I Divisão
The 2018-19 season of the Campeonato Nacional da I Divisão de Futsal will be the 29th season of top-tier futsal in Portugal. It will be named Liga Sport Zone for sponsorship reasons. The regular season started on September 15, 2018, and will end in April 2019. After the end of the regular season, the top eight teams will play the championship playoffs.

Viseu 2001 and Eléctrico FC will participate for the first time in their history in the Liga Portuguesa de Futsal after being promoted from the II Divisão de Futsal.