Jeremiah Clarke was an English baroque composer and organist.
Clarke is best remembered for a popular keyboard piece: the Prince of Denmark's March, which is commonly called the Trumpet Voluntary, written about 1700. From c. 1878 until the 1940s the work was attributed to Henry Purcell, and was published as Trumpet Voluntary by Henry Purcell in William Sparkes's Short Pieces for the Organ, Book VII, No. 1 (London, Ashdown and Parry). This version came to the attention of Sir Henry J. Wood, who made two orchestral transcriptions of it, both of which were recorded. The recordings further cemented the erroneous notion that the original piece was by Purcell. Clarke's piece is a popular choice for wedding music, and has been used in royal weddings.
The famous Trumpet Tune in D (also incorrectly attributed to Purcell) was taken from the semi-opera The Island Princess, which was a joint musical production of Clarke and Daniel Purcell (Henry Purcell's younger brother)—probably leading to the confusion.