Willem Victor Bartholomeus (Bunde, 11 February 1825 – Zwolle, 13 August 1892) was a Dutch organist and conductor.
He was born in the family of sexton/organist/church singer Jan/Jean Bartholomeus and Maria Cornelia Isabella Hagemans.
His teacher was François-Joseph Fétis, who taught him piano, church organ and composition.
He was also a member and later conductor of the Liedertafel Caecilia in Zwolle and led the choir of St Michael's Church, which performed polyphonic works with the help of boys' voices, such as Mozart's Mass in C minor.
[2] In 1871 he co-founded the Zangvereeniging for the practice of classical music in Zwolle, which in early 1872 performed The Seasons by Joseph Haydn under his direction, accompanied by the Orchest van Stumpff from Amsterdam and local dilettantes as soloists.