Karl Emil Moritz Genetz (October 24, 1852 – May 1, 1930) was a Finnish composer of patriotic choral works.

Genetz was born in Impilahti, Finland (now in the Republic of Karelia). He became professionally employed as a language teacher, but gained prominence for his choral compositions. After studying chemistry and law at the University of Helsinki, he became a singer in the Finnish Opera, and traveled on a state grant to study at the Dresden Conservatory from 1875 to 1877. He spent time in various cities of Finland, including Hameenlinna, Helsinki, and Hamina, working as a German language teacher, composing patriotic works, and conducting choirs. He died in Helsinki in 1930. Many of his works are still well known in modern Finland.