Christian Peder Wilhelm Geisler (28 April 1869 – 19 August 1951) was a Danish organist and composer.

He graduated at the Conservatory of Music in the years 1887-90 of, among others, Niels W. Gade, J.P.E. Hartmann and Gottfred Matthison-Hansen and studied 1895–96 with Max Bruch in Berlin. After his return, he acted as a composer, vocalist and organist. He was a teacher at the United Church Schools and Ingrid Jespersen School. From 1893 to 1911 he was employed as an organist at Reformed Church and from 1911 to 1939 at the church of Garnison.

He was a temporary with both Hartmann and Gade, who both embraced his musical attitude. His music is in the same style as theirs, and most of it was composed before the First World War. He composed in many genres.