Arnold Matthias Brunckhorst (1670–1725) was a German organist and composer.
In 1697, he assumed the organist's post at the Stadtkirche in Celle.
Only a few works by him have survived: two small oratorios - for Christmas and Easter, one single-movement keyboard sonata in A major (regarded as the earliest German documentation of the form of the two-part sonata structure, comparable to the formal type encountered in Domenico Scarlatti), and a Praeludium in E minor for organ.
A "Präludium & Fuge" in g minor - which was found not long ago in Berlin and was at first believed to be composed by Nicolaus Bruhns - is now believed to be composed by Brunckhorst.
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