Aivars Kalējs (April 22, 1951, Riga, Latvian SSR) is a Latvian organist, composer and pianist.
He is concert organist at the Dome Cathedral in Riga and chief organist for the New St. Gertrudes Lutheran Church. He has performed solo recitals and toured with various ensembles throughout North America, Europe, and Asia, included participating in dozens of international organ festivals in the US, Belgium, Italy, Germany, Denmark, and Estonia. From 1980 to 2004, he has recorded six solo CDs and participated in 34 CD recordings, including as chief organist for the Riga Dome Boys' Choir.
As a composer, his pieces have been played in organ concerts around the world and have won several composition awards.
He studied under Ādolfs Skulte, Nikolajs Vanadziņš and Lūcija Garūta.