The 2017–18 Segona Divisió, also known as the Lliga Biosphere,[1] was the 19th season of second-tier football in Andorra.
This season began on 23 September 2017 and ended on 13 May 2018.
[2] Inter Club d'Escaldes won the league in the previous season and were promoted along with second-placed Penya Encarnada to the 2017–18 Primera Divisió.
[3] Ten clubs competed for the league title.
[4] Five clubs then advanced to a play-off to determine which club would be promoted.