Johannes Aal (c. 1500 – 28 May 1553) was a Swiss Roman Catholic theologian, composer and dramaturg. Aal was born in Bremgarten, Switzerland, and was pastor there until 1529, then Leutpriester in Baden until 1536. At the collegiate church of Solothurn, he became preacher and choir leader in 1538. From 1544 to 1551, he was provost of the college of canons, where he died. As a musician, he composed a tune in 16 verses on Saint Maurice and Saint Ursus of Solothurn.