Sextus Miskow (3 February 1857 – 24 November 1928) was a Danish singer, composer and music critic.
After two years in military school starting in 1871, Miskow continued his studies in violin and piano.
At times he was also a music critic, including for Berlingske Tidende, Denmark's oldest newspaper, from 1903 to 1914, and choral conductor of the Copenhagen Workers' Choir, which he founded in 1915.
He is most associated with one of his first songs, Den spillemand snapped fiolen fra væg, with lyrics by Holger Drachmann (1846–1908).
Allegretto Fantasia for clarinet and piano by Miskow appears in "Concert and Contest", a widely used collection of intermediate level clarinet solos compiled and edited by Himie Voxman.