Vienna Philharmonic (VPO; German: Wiener Philharmoniker) is an orchestra that was founded in 1842 and has been considered to be one of the finest in the world.

The Vienna Philharmonic is based at the Musikverein in Vienna, Austria. Its members are selected from the orchestra of the Vienna State Opera. Selection involves a lengthy process, with each musician demonstrating their capability for a minimum of three years' performance for the opera and ballet. After this probationary period, the musician may request an application for a position in the orchestra from the Vienna Philharmonic's board. The Vienna Philharmonic hires no musician over 35 years of age, and has a mandatory retirement age of 65; 30 years of service are required for full pension.

Until the 1830s, orchestral performance in Vienna was done by ad hoc orchestras, consisting of professional and (often) amateur musicians brought together for specific performances. In 1833, Franz Lachner formed the forerunner of the Vienna Philharmonic, the Künstlerverein – an orchestra of professional musicians from the Vienna Court Opera (Wiener Hofoper, now the Vienna State Opera); it gave four concerts, each including a Beethoven symphony. The Vienna Philharmonic itself arose nine years later, in 1842, hatched by a group who met regularly at the inn 'Zum Amor', including the poet Nikolaus Lenau, newspaper editor August Schmidt, critic Alfred Becker, violinist Karlz Holz, Count Laurecin, and composer Otto Nicolai who was also the principal conductor of a standing orchestra at a Viennese theater. Mosco Carner wrote in The New Grove Dictionary of Music and Musicians that "Nicolai was the least enthusiastic about the idea, and had to be persuaded by the others; he conducted the first [concert] on 28 March 1842." The orchestra was fully independent, consisted of members of the Hofoper orchestra, and made all of its decisions by a democratic vote of its members; it had its day-to-day management handled by a democratically elected body, the administrative committee.

Nicolai and the orchestra gave only 11 concerts in the ensuing five years, and when Nicolai left Vienna in 1847, the orchestra nearly folded (New Grove notes the disruption caused by the Revolution of 1848 as a hindrance). Between 1854 and 1857, Karl Eckert – the first permanent conductor of the Vienna Court Opera (Wiener Hofoper)– led the (associated) Vienna Philharmonic in a few concerts. In 1857, Eckert was made Director of the Hofoper – the first musician to have been given the post; in 1860, he conducted four subscription concerts of the Vienna Philharmonic. Since that time, writes Vienna Philharmonic violinist and president Clemens Hellsberg, "the 'Philharmonic Concerts' have been staged without interruption."

In 1860, the orchestra elected Otto Dessoff to be the permanent conductor. According to Max Kalbeck, the Vienna-based music critic, newspaper editor, and biographer, the fame and excellence of the Vienna Philharmonic resulted from Dessoff's "energy and sense of purpose." Clemens Hellsberg gives specifics, writing that during the Dessoff years, the Vienna Philharmonic's "repertoire was consistently enlarged, important organizational principles (music archives, rules of procedure) were introduced and the orchestra moved to its third new home [in 1870], the newly built Goldener Saal in the Musikverein building in Vienna [in which it still performs], which has proved to be the ideal venue, with its acoustical characteristics influencing the orchestra's style and sound." After fifteen years, in 1875, Dessoff was "pushed out of his position in Vienna through intrigue", and he left Vienna to become conductor (Hofkapellmeister) of the Badische Staatskapelle in Karlsruhe, Germany. In Karlsruhe the next year, he fulfilled the request of his friend Johannes Brahms to conduct the first performance of his Symphony no. 1; in 1873, Brahms had conducted the premiere of his Variations on a Theme by Haydn with Dessoff's Vienna Philharmonic.

In 1875, the orchestra chose Hans Richter to take Dessoff's place as subscription conductor. He remained until 1898, except for the season 1882/1883, when he was in dispute with the orchestral committee (during this hiatus, Wilhelm Jahn of the Vienna Court Opera served as subscription conductor). Richter led the VPO in the world premieres of Brahms's Second Symphony (in 1877), Tragic Overture (in 1880), and Symphony no. 3 (in 1883), the Violin Concerto of Tchaikovsky (in 1881), and in 1892 the 8th symphony of Anton Bruckner. It was Richter who in 1881 appointed Arnold Rosé as concertmaster, who was to become Gustav Mahler's brother-in-law and was concertmaster until the Anschluss in 1938. In order to be eligible for a pension, Richter intended to remain in his position for 25 years (to 1900), and he might have done so, given that the orchestra unanimously re-elected him in May 1898. But he resigned on 22 September, citing health reasons, although biographer Christopher Fifield argues that the real reasons were that he wanted to tour, and that "he was uneasy as claques in the audience formed in favour of Gustav Mahler" (who was triumphing as director of the Hofoper). Richter recommended Mahler or Ferdinand Löwe to the orchestra as his replacement.

In 1898, on 24 September, the orchestra elected Gustav Mahler. (On 30 May 1899, pro-Mahler and pro-Richter factions had a "heated committee meeting"; matters were finally resolved in August when Richter wrote to his supporters "gently refusing their offer".) Under Mahler's baton, the Vienna Philharmonic played abroad for the first time at the 1900 Paris World Exposition. While Mahler had strong supporters in the orchestra, he faced dissension from other orchestral members (an unreconstructed pro-Richter faction plus an anti-Semitic one, according to Jens Malte Fischer), criticism of his re-touchings of Beethoven, and arguments with the orchestra and over new policies he imposed; ultimately, "his working relationship with the Vienna Philharmonic continued to be fueled by resentment and broke down completely in November 1900". He resigned on 1 April 1901, citing health concerns as a pretext, like Richter, but continuing to conduct actively elsewhere (he remained director of the associated Hofoper until 1907).

In 1901, Joseph Hellmesberger, Jr. briefly took his place; he remained only until 1903.