Father Rufinus Widl (26 September 1731 – 12 March 1798) was a Bavarian Benedictine monk and a lecturer at Salzburg University from 1767 until his death.

Widl was born in Frauenwörth, Frauenchiemsee, His most famous work today is the opera Apollo et Hyacinthus to music by Mozart which was an entr'acte to a play performed by students at Salzburg University with the name Clementia Croesi, which was also written by Father Widl, and first performed in 1767. Widl died in Obing, Bavaria.