Ingo Metzmacher (born 10 November 1957, Hanover) is a German conductor. He is the son of the cellist Rudolf Metzmacher and the research biologist Lore Schoen. His musical education in piano, music theory and conducting was in Hanover, Salzburg and Cologne. He later joined the Ensemble Modern in 1981 as its pianist, and became the orchestra's conductor in 1985.
In 1994, Metzmacher conducted the premiere of the revised version of Hans Werner Henze's Symphony No. 6. In 1997, he conducted the world premiere of Henze's Symphony No. 9 at the composer's request. From 1997 to 2005, he served as General Music Director of City of Hamburg, which covered the Hamburg State Opera and its Philharmonic Orchestra. He left his post in Hamburg after disputes with the city over funding.
In 2005, he became chief conductor of De Nederlandse Opera. In February 2007, De Nederlandse Opera announced that Metzmacher would step down from his post as DNO's Chief Conductor in 2008. From 2007-2010 he was the Chief Conductor and Artistic Director of the Deutsches Symphonie-Orchester Berlin (DSO-Berlin). His original contract with the DSO-Berlin was through 2011. However, after reports of disputes over financing and a threatened reduction in the size of the orchestra, in March 2009, Metzmacher announced his early resignation from the DSO-Berlin principal conductorship as of the summer of 2010.  His final concerts as the orchestra's principal conductor were in June 2010 in Berlin and in August 2010 at The Proms.
- Alban Berg: Wozzeck
- Benjamin Britten: Serenade for Tenor, Horn and Strings (Ian Bostridge, tenor; Marie Luise Neunecker, horn)
- the complete symphonies of Karl Amadeus Hartmann 
- Hans Werner Henze: Symphony No. 9
- Luigi Nono: Prometeo (Ricordi/EMI Classics)
- Richard Strauss: Horn Concertos
- Hans Werner Henze: Requiem (Sony Classical)
- John Cage: Sixteen Dances for Soloist and Company of 3 (RCA)
- Charles Ives: Songs/Orchestral Sets/From The Steeples and Mountains (EMI)
- Tim Ashley (8 December 2000). "Thoroughly modern maestro". The Guardian. Retrieved 2007-05-21.
- Tim Ashley (21 November 2003). "Going out with a bang". The Guardian. Retrieved 2007-05-21.
- "Artist Profile: Ingo Metzmacher". Opus 3 Artists. Retrieved 2012-06-28.
- Manuel Brug (2009-03-26). "Dirigent Ingo Metzmacher hört beim DSO auf". Die Welt. Retrieved 2010-08-20.
- Manuel Brug (2009-05-04). "'Es tut mir leid – für Orchester und Publikum'". Die Welt. Retrieved 2010-08-20.
- Matthias Nöther (2010-06-16). "Ein Vorbild im Zweifeln: Ingo Metzmacher gibt sein Abschiedskonzert beim DSO". Berliner Zeitung. Retrieved 2010-08-20.
- Tim Ashley (2010-08-11). "DSO Berlin/Metzmacher (Royal Albert Hall, London)". The Guardian. Retrieved 2010-08-20.
- Andrew Clements (19 May 2000). "The other Amadeus". The Guardian. Retrieved 2007-05-21.
- Guy Rickards (2000). "Record reviews ("Karl Amadeus Hartmann: Symphony No.1, 'Essay towards a Requiem'" and other issues in series)". Tempo (New Ser.), 211, pp. 43, 45.
- Dutch language announcement from De Nederlandse Opera of Metzmacher's 2008 resignation
- English language announcement from De Nederlandse Opera of Metzmacher's 2008 resignation
|Music Director, Hamburg State Opera
Edo de Waart
|Chief Conductor, De Nederlandse Opera
|Principal Conductor, Deutsches Symphonie-Orchester Berlin