|Birth name||Simon John O'Neill|
|Born||1971 (age 45–46)
Ashburton, New Zealand
O'Neill was born in Ashburton, New Zealand, and received his musical training at the University of Otago, Victoria University of Wellington, graduating with an honours degree in music, before receiving scholarships to the Manhattan School of Music (where he earned a Master of Music degree in 2000) and the Juilliard Opera Center. In late 2016 he was awarded Doctor of Music (Honoris Causa) from Victoria University of Wellington . O'Neill was appointed Officer of the New Zealand Order of Merit in the 2017 Queen's Birthday Honours.
While studying at the Juilliard Opera Center, he sang the title role in Idomeneo, Sam Polk in Susannah, and Chevalier de la Force in Dialogues of the Carmelites under the baton of Julius Rudel. Subsequently at San Francisco's Merola Opera Program , he performed Rodolfo in La bohème as well as the title role in La clemenza di Tito with Wolf Trap Opera . In 2004, O'Neill was the subject of a TVNZ, BBC documentary The Understudy  about his contract at the Metropolitan Opera to cover Siegmund for Plácido Domingo in the Met's Otto Schenk production of Die Walküre.
O'Neill made his Metropolitan Opera debut as the Gran Sacerdote in Mozart's Idomeneo with James Levine, his Royal Opera House debut as Jenik in Smetana's The Bartered Bride  with Sir Charles Mackerras followed by Florestan (Fidelio) with Antonio Pappano and Salzburg Festival in Die Zauberflöte with Riccardo Muti and his Vienna Staatsoper debut as the title role in Parsifal with Christian Thielemann.
He performed the role of Siegmund in Richard Wagner's Die Walküre at the Royal Opera House, Covent Garden, with Sir Antonio Pappano, Teatro alla Scala and Berlin Staatsoper with Daniel Barenboim, Vienna Staatsoper with Franz Welser-Möst, Bayerische Staatsoper with Kent Nagano, Hamburgische Staatsoper with Simone Young, the Deutsche Oper  and the Metropolitan Opera with Donald Runnicles and in the 2013 Otto Schenk Ring production and in the Robert Lepage production with Fabio Luisi .
He made his 2009 debut in the title role of Verdi's Otello with Sir Colin Davis and the London Symphony Orchestra and in 2010 he debuted at the Bayreuth Festival in the title role of "Lohengrin" , returning in the title role of Parsifal in 2011. The same year, O'Neill made his role debut as Walter von Stolzing in Die Meistersinger von Nürnberg at Covent Garden.
His performances have included; the title roles of Parsifal , Lohengrin at the Royal Opera House with Sir Antonio Pappano, Otello and Lohengrin at Houston Grand Opera, the title role in Verdi's Otello and Sergei in his Opera Australia debut in Lady Macbeth of Mtsensk, Florestan with Daniel Barenboim at the BBC Proms  with the West-Eastern Divan Orchestra and made his Carnegie Hall debut as Caesar in Samuel Barber's Antony and Cleopatra for New York City Opera, returning with the Metropolitan Opera Orchestra and James Levine for Mahler's Das Lied von der Erde and sang in Beethoven's Missa solemnis with the Boston Symphony.
O'Neill is the patron of the New Zealand Association of Teachers of Singing (Newzats), the IFAC Hands New Zealand Singing School, New Zealand Opera Circle 100, the New Zealand Brass Foundation, the Auckland Boys' Choir, the Ashburton MSA Choir, the Christchurch City Choir and the UK Singingworks. He appears on the 1998 New Zealand one-dollar performing arts postage stamp.
- "Father and Son - Wagner Scenes and Arias (EMI) New Zealand Symphony Orchestra, Pietari Inkinen
- Parsifal (Opus Arte) The Royal Opera Covent Garden, Sir Antonio Pappano
- Die Walküre (Arthaus Musik) Der Ring des Nibelungen Teatro alla Scala, Daniel Barenboim
- Otello (LSO Live) London Symphony Orchestra, Sir Colin Davis
- Der Freischütz (LSO Live) London Symphony Orchestra, Sir Colin Davis
- Mahler: Symphony No. 8 (Phantom) Sydney Symphony, Vladimir Ashkenazy
- Der Sturm (Netherlands Radio Philharmonic Orchestra), Thierry Fisher Hyperion Records
- The Magic Flute (Decca) Salzburg Festival, Riccardo Muti
- Le roi Arthus (Telarc) BBC Symphony Orchestra, Leon Botstein
- Kiri and Friends (EMI) Auckland Philharmonia
- 2017 Officer of the New Zealand Order of Merit Queen's Birthday Honours List
- 2016 Doctor of Music (Honoris Causa) Victoria University of Wellington
- 2005 Arts Foundation of New Zealand Laureate Award
- Grand finalist in the 2002 Metropolitan Opera National Council Auditions
- 2003 United Kingdom Wagner Society Prize
- 2000 Masters of Music Manhattan School of Music
- 1999 Metropolitan Opera National Council Auditions Encouragement Award
- 1998 Fulbright Scholarship
- 1995 Bachelor of Music with Honours Victoria University of Wellington
- 1994 Bachelor of Music University of Otago
- "Victoria University of Wellington Honorary Doctorate". Victoria University of Wellington. 14 June 2017. Retrieved 14 June 2017.
- "San Fransisco Opera". San Francisco Opera Merola Programme. 14 June 2017. Retrieved 14 June 2017.
- "Wolftrap Opera". Wolftrap Opera. 14 June 2017. Retrieved 14 June 2017.
- "Great Southern Film". Great Southern Film. 14 June 2017. Retrieved 14 June 2017.
- "Simon O'Neill". Opera Australia. Retrieved 4 April 2009.
- "Royal Opera House Collections The Bartered Bride". ROH. 14 June 2017. Retrieved 14 June 2017.
- "Royal Opera House Die Walküre BBC". BBC. 14 June 2017. Retrieved 14 June 2017.
- "Deutsche Oper Berlin". Deutsche Oper. 14 June 2017. Retrieved 14 June 2017.
- "Metropolitan Opera Die Walküre" (PDF). The Met Opera. 14 June 2017. Retrieved 14 June 2017.
- "London Symphony Orchestra Otello Parsifal". LSO Live. 14 June 2017. Retrieved 14 June 2017.
- "Bayreuth Festival Lohengrin Parsifal". Bayreuth Festival. 14 June 2017. Retrieved 14 June 2017.
- "Royal Opera House Parsifal". ROH. 14 June 2017. Retrieved 14 June 2017.
- "West-East Divan Orchestra with Barenboim". The Independent. 14 June 2017. Retrieved 14 June 2017.
- "Newzats Patron". Newzats. 14 June 2017. Retrieved 14 June 2017.
- "New Zealand Singing School Patron". Singing School NZ. 14 June 2017. Retrieved 14 June 2017.
- "New Zealand Brass Foundation Patron". Brass Foundation NZ. 14 June 2017. Retrieved 14 June 2017.
- "UK Singing Works Patron". Singing Works. 14 June 2017. Retrieved 14 June 2017.
- "Queen's Birthday honours list 2017". Department of the Prime Minister and Cabinet. 5 June 2017. Retrieved 5 June 2017.
- "Simon O'Neill". Askonas Holt. Askonas Holt. Retrieved 15 April 2015.
- "Simon O'Neill". Royal Opera House. Retrieved 14 June 2017.
- "Simon O'Neill". Bayreuth Festival. Retrieved 14 June 2017.
- "Simon O'Neill". San Francisco Opera. Retrieved 14 June 2017.
- "Tenors in training", nysun.com
- Profile, nytimes.com
- Profile, newyorker.com
- Profile, iht.com
- Profile, artsfoundation.org.nz
- Profile, stuff.co.nz