Helmut Vaag (born Arthur-Helmuth Vaag; May 29, 1911 Juuru Parish – July 8, 1978 Tallinn) was an Estonian actor and director.

1927-1931 he studied at Tallinn Töölisteater's studying studio. 1933–1940 he was an actor at Tallinn Töölisteater, 1940–1951 and 1961–1975 at Estonian Drama Theatre, 1952–1953 at Estonian Puppet Theatre. 1952–1961 he was an estrade actor at Estonian SSR State Philharmonic (nowadays Eesti Kontsert). Besides theatre roles he played also in several films.