Nikolaus Simrock (23 August 1751 in Mainz – 12 June 1832 in Bonn) was a German horn player at the court of the Elector of Cologne in Bonn and a music publisher. He was a friend of Ludwig van Beethoven and founder of the N. Simrock music publishing house.[1] "Highly esteemed as a man and a musician", he remained in contact with Beethoven throughout the 1790s and is regarded as a "reliable witness" to Beethoven's years in Bonn.[2][3]