Frederick III (Friedrich Wilhelm Nikolaus Karl; 18 October 1831 – 15 June 1888), or Friedrich III, was German Emperor and King of Prussia for 99 days from 9 March 1888 until his death in June that year, during the Year of the Three Emperors.
Known informally as "Fritz", he was the only son of Emperor Wilhelm I and was raised in his family's tradition of military service. Following the unification of Germany in 1871 his father, then King of Prussia, became German Emperor. Upon Wilhelm's death at the age of ninety on 9 March 1888, the thrones passed to Frederick, who had been German Crown Prince for seventeen years and Crown Prince of Prussia for twenty-seven years. Frederick was suffering from cancer of the larynx when he died at the age of 56, following unsuccessful medical treatments for his condition.