Jacques Offenbach (born Jacob Offenbach; 20 June 1819 – 5 October 1880) was a German born French composer and cellist of the Romantic era and one of the originators of the operetta form. Of German - Jewish ancestry, he was one of the most influential composers of popular music in Europe in the 19th century, and many of his works remain in the repertory.

Offenbach's numerous operettas, such as Orpheus in the Underworld, and La belle Hélène, were extremely popular in both France and the English speaking world during the 1850s and 1860s. They combined political and cultural satire with witty grand opera parodies. His popularity in France went down during the 1870s after the Second Empire, and he fled France, but during the last years of his life, his popularity rebounded, and several of his operettas are still performed. While his name remains associated most closely with the French operetta and the Second Empire, it is Offenbach's one fully operatic masterpiece, Les contes d'Hoffmann (The Tales of Hoffmann), composed at the end of his career, that has become the most familiar of Offenbach's works in major opera houses.

Offenbach's father, Isaac Juda Eberst, born 26 October 1779 in Offenbach am Main, took the name Offenbach in 1808 when he was already in Deutz where he had moved in 1802. He was a man of many talents who worked as a bookbinder, translator, publisher, music teacher and composer and became a cantor some 30 years later, and himself wrote several works, including a well known Haggadah (Passover home service). He died on 26 April 1850. In 1816 the family moved to Cologne, where his son Jacob (changed to Jacques when he arrived to study in Paris) was born in 1819.

In 1833 his father took Jacob to Paris and managed to get him admitted as a cello student to the Paris Conservatoire. Financial difficulties forced Jacques, as he was known by then, to break off his studies at the end of 1834. After a few odd jobs he eventually found a position as a cellist in the orchestra of the Opéra - Comique. He soon made a name for himself as a cello virtuoso, appearing with famous pianists like the young Anton Rubinstein, Franz Liszt, Felix Mendelssohn, and, very often, with Friedrich von Flotow, with whom he performed jointly composed pieces. In 1844, he married Hérminie D'Alcain, the daughter of the Spanish Ambassador, and allegedly converted to Catholicism, though no parish records exist to confirm this. He moved to Germany with his wife and daughter in 1848 to escape revolutionary violence in France, but returned after a brief stay.

In 1850, he became conductor of the Théâtre Français, but the musical theatre establishment in Paris did not immediately accept his sometimes pointed songs and music. Therefore, in 1855, he rented for the Expo season a little theatre on the Champs - Élysées and named it the Bouffes Parisiens. In the following winter he moved the Bouffes to a larger and, above all, heatable theatre on rue Monsigny / Passage Choiseul (still in the family's hands). There he began a successful career devoted largely to composing operettas. In the early years, Offenbach's permit limited his productions to one act works with only a few speaking or singing characters. Les deux aveugles, Ba-ta-clan (both premiering in 1855), and La bonne d'enfant were three of his popular works from this period. Only in 1858, after these restrictions had been lifted, did it become possible for him to produce his first full length work, Orpheus in the Underworld.

Offenbach wrote almost 100 operettas, some of which were wildly popular in his time, and his most popular works are still performed regularly today. The best of these works combined hilarious political and cultural satire with witty grand opera parodies. His best known operettas in the English speaking world are Orpheus in the Underworld (1858), La belle Hélène (1864), La vie parisienne (1866), The Grand Duchess of Gerolstein (1867), and La Périchole (1868). Les brigands (1869) was very popular in the English speaking world initially but was later forgotten.

Offenbach worked with the librettists Meilhac and Halévy more often than any other librettist or team and produced some of his most successful works with them. He said of his relationship with the team: Je suis sans doute le Père, chacun des deux autres est à la fois mon Fils et Plein d'Esprit (literally "No doubt I am the Father; each of the two others is at once my Son and Full of Verve" — esprit meaning both [Holy] Spirit and wit and Plein d'Esprit rhyming with Saint Esprit.

Offenbach was much attached to his adopted country, and many of his works are very patriotic in nature. But when war broke out between France and Germany in 1870, ending the Second Empire, he was criticized by the French press as an immigrant agent of Bismarck and was forced to flee. Reviled by the German press as a traitor to his native Germany, he brought his family to safety in Spain and then toured in Italy and Austria. When he returned to Paris in June 1871 after the war, his operettas were out of favor with the public. Bonapartists thought that, by "turning royalty into a farce and the army into a joke", Offenbach's parodies had undermined Napoleon III's France and were therefore the cause, or at least one of the causes, of the defeat. Ironically, liberals blamed Offenbach for his perceived loyalty to the deposed emperor, and he had trouble with the police.

During 1875 Offenbach was forced into bankruptcy. In 1876, though, a successful tour of the United States at the occasion of the U.S. Centennial Exhibition enabled him to recover part of his losses. While there, he conducted two of his operettas, La vie parisienne and La jolie parfumeuse, and also gave as many as 40 concerts in New York and Philadelphia. Offenbach enjoyed renewed popularity with Madame Favart (1878), which featured a fantasy plot about the real life French actress Marie Justine Favart, and La fille du tambour - major, a musically inventive piece.

Experts concur that his last work, The Tales of Hoffmann, was his only grand opera: it is more serious and ambitious in its musical scope than his other works, perhaps reflecting the wish of the humourist to be taken seriously. This opera remained, however, somewhat unfinished when the composer died. It was prepared for performance by his friend Ernest Guiraud and premiered in 1881, although subsequent "editions" emerged in 1976 (Fritz Oeser) and 1999 (Michael Kaye).

Offenbach died in Paris in 1880 at the age of 61 and is buried in the Montmartre Cemetery, Paris.

In 1938, Manuel Rosenthal (1904 – 2003) assembled the popular ballet Gaîté Parisienne from his own orchestral arrangements of melodies from Offenbach's operettas and the "barcarolle" from The Tales of Hoffmann, and in 1953 the same composer assembled a symphonic suite, Offenbachiana, likewise from music by Offenbach.