The 2009–10 Primera Divisió was the fifteenth season of top-tier football in Andorra.
UE Engordany was relegated and will be replaced by Segona Divisió champions Casa Estrella del Benfica for the 2010–11 season.
FC Ranger's were relegated after last season due to finishing in 8th place.
Inter kept their spot in Primera Divisió by winning 10–9 on penalties after an aggregated 3–3 tie with their village rivals.
Encamp won the playoff, 5 – 2 on aggregate, thus keeping their place in Primera Divisió.