Frederick William (17 October 1819 – 30 May 1904) was a German sovereign who ruled over the state of Mecklenburg-Strelitz as grand duke from 1860 until his death.

He spent his youth in Neustrelitz and later went to study history and jurisprudence in University of Bonn where he befriended Prince Albert of Saxe-Coburg and Gotha.

Friedrich Wilhelm was a large land owner with more than half of the entire grand duchy as his personal property.

[2] He died at Neustrelitz on 30 May 1904 and was succeeded by his only surviving son, Adolf Friedrich V. Friedrich Wilhelm was married on 28 June 1843 at Buckingham Palace to his first cousin, Princess Augusta of Cambridge, a member of the British royal family and a granddaughter of King George III.

They had two sons: Friedrich Wilhelm and his wife Augusta celebrated their diamond wedding anniversary by distributing 25 Pfennig from the public treasury to every citizen of the grand duchy.