Franz Lehár (Hungarian: Lehár Ferenc; 30 April 1870 – 24 October 1948) was an Austro-Hungarian composer. He is mainly known for his operettas, of which the most successful and best known is The Merry Widow (Die lustige Witwe).
Lehár was born in the northern part of Komárom, Kingdom of Hungary, Austria-Hungary (now Komárno, Slovakia), the eldest son of Franz Lehár (senior) (1838–1898), an Austrian bandmaster in the Infantry Regiment No. 50 of the Austro-Hungarian Army and Christine Neubrandt (1849–1906), a Hungarian woman from a family of German descent. He grew up speaking only Hungarian until the age of 12. Later he put an acute accent above the "a" of his father's surname "Lehár" to indicate the vowel in the corresponding Hungarian orthography.
While his younger brother Anton entered cadet school in Vienna to become a professional officer, Franz studied violin at the Prague Conservatory, where his violin teacher was Antonín Bennewitz, but was advised by Antonín Dvořák to focus on composition. However, the Conservatory's rules at that time did not allow students to study both performance and composition, and Bennewitz and Lehár senior exerted pressure on Lehár to take his degree in violin as a practical matter, arguing that he could study composition on his own later. Lehár followed their wishes, against his will, and aside from a few clandestine lessons with Zdeněk Fibich he was self-taught as a composer. After graduation in 1888 he joined his father's band in Vienna, as assistant bandmaster. Two years later he became bandmaster at Losoncz (Lučenec), East Slovakia, making him the youngest bandmaster in the Austro-Hungarian Army at that time, but he left the army and joined the navy. With the navy he was first Kapellmeister at Pola (Pula) from 1894 to 1896, resigning in the later year when his first opera, Kukuschka (later reworked as Tatjana in 1906), premiered in Leipzig. It was only a middling success and Lehár eventually rejoined the army, with service in the garrisons at Trieste, Budapest (1898) and finally Vienna from 1899 to 1902. In 1902 he became conductor at the historic Vienna Theater an der Wien, where his operetta Wiener Frauen was performed in November of that year.