Othmar Wessely (31 October 1922 – 20 April 1998) was an Austrian musicologist.
Born in Linz, Wessely studied musicology at the University of Vienna with Erich Schenk.
From 1974 Wessely was the director of publications of the Denkmäler der Tonkunst in Austria (DTÖ).
From 1982 to 1998, he was chairman of the Kommission für Musikforschung [de] of the Austrian Academy of Sciences and scientific director of the Anton Bruckner Institut Linz [de].
Both were buried at Döbling Cemetery (group 32, row 4, number 25) (tombstone toppled over).