Peter Gelb (born 1953) is an American arts administrator. Since August 2006, he has been General Manager of the Metropolitan Opera in New York City.

While in high school, Gelb began his association with the Metropolitan Opera as an usher. At age 17, Gelb began his career in classical music as an office boy to impresario Sol Hurok.

Gelb managed the Boston Symphony Orchestra’s 1979 China tour. The following year Gelb became Vladimir Horowitz's manager. Gelb assisted the pianist in the revival of his performing career, and managed his return to Russia in 1986.^{[citation needed]}

In 1982, Gelb founded, and was president of, CAMI Video, a division of Columbia Artists Management. In this capacity, for six years he was executive producer of "The Metropolitan Opera Presents", the Met's series of televised opera broadcasts. Gelb produced 25 televised productions for the Met.^{[citation needed]}

Gelb was president of Sony Classical Records from 1995 to 2006. Gelb pursued a strategy of emphasizing crossover music over mainstream classical repertoire. Examples include cellist Yo-Yo Ma, who was encouraged to record Americana, including an album with fiddler and composer Mark O'Connor and double-bassist and composer Edgar Meyer, Appalachia Waltz; electronic composer Vangelis, who recorded the choral symphony Mythodea; and Charlotte Church, a pop artist who started her career as a classical singer.

Gelb became the 16th General Manager of the Metropolitan Opera, taking over from Joseph Volpe, on August 1, 2006. He launched his tenure with several new productions, including Madama Butterfly directed by Anthony Minghella; The Barber of Seville by Bartlett Sher; and Tan Dun's new opera The First Emperor directed by Zhang Yimou.

Gelb launched a number of new ventures for the Met, such as taking advantage of new media technology to distribute Met performances to a wider global audience. This became The Met: Live in HD series, the Met becoming the first performing arts company to offer live high-definition broadcasts of its operas to cinemas and other performing arts centers in many countries of the world. The series gained both a Peabody and an Emmy Award. Digitally recorded performances were later offered on public television stations and released on DVDs and for streaming via Met Opera on Demand.

During his tenure at the Met, Gelb has spearheaded the production of contemporary works, including the staging of two of John Adams's operas, Doctor Atomic and Nixon in China, with a third Adams opera, The Death of Klinghoffer, premiering in October 2014.^{[needs update]} His other ideas have included an annual "family-oriented" presentation at Christmas time, and collaborations with Lincoln Center Theater to develop new musical works with musicians such as Wynton Marsalis, Rachel Portman, and Rufus Wainwright. In January 2007 Gelb announced a commission for a new opera from Osvaldo Golijov, tentatively scheduled for the 2010–11 season. However, following the death in 2008 of Anthony Minghella who was to have written the libretto, the premiere was postponed to 2018.^{[needs update]}