Elgar Howarth (4 November 1935 – 13 January 2025) was an English conductor, composer and trumpeter. Grove noted that "his performances are marked by powerful concentration and a clear communication of sometimes complex scores". He conducted many world premieres, including Ligeti's Le Grand Macabre and four operas by Harrison Birtwistle. He composed mainly music for brass instruments and brass bands, some under the pseudonym W. Hogarth Lear. As a player, he was one of the trumpeters who performed with the Beatles on the song "Magical Mystery Tour". The author of a feature article about Howarth in 1999 wrote that "as trumpeter, composer and conductor, he has featured in many of the important musical developments in the UK and beyond over the past 40 years".

Howarth was born in Cannock, Staffordshire, on 4 November 1935, the son of Oliver and Emma Howarth. His father was an engineer who also conducted the Barton Hall Works Band, in which Elgar played cornet and his brother Stanford trombone.

Hogarth was educated at the University of Manchester and the Royal Manchester College of Music (RMCM, the predecessor of the Royal Northern College of Music), from 1953–56 where his fellow classmates included the composers Harrison Birtwistle, David Ellis, Alexander Goehr, Peter Maxwell Davies and the pianist John Ogdon. Together they formed New Music Manchester, a group dedicated to the performance of new music.

After his national service in the Central Band of the Royal Air Force finished in 1958, Howarth immediately began his career in the trumpet section of the Royal Opera orchestra conducted by Rudolf Kempe. He was principal trumpet in the Royal Philharmonic Orchestra from 1964 to 1970, playing also with the Philip Jones Brass Ensemble, the Nash Ensemble and from 1969 as a founding member of the London Sinfonietta. He played the opening bars of Michael Tippett's King Priam at its Coventry premiere in 1962, conducting the whole work years later for English National Opera (ENO). Kempe was his conducting idol, in whom he admired "an incredibly clear beat with the right hand, and the left hand for all the nuance" which he sought to emulate.

Howarth's (unplanned) conducting debut was with the London Sinfonietta on tour in Italy in 1969; his first operatic assignment was for The Rake's Progress for the Royal Northern College of Music at Sadler's Wells in December 1973. Following further work on the concert platform, Ligeti engaged him for the premiere of his Le Grand Macabre at the Royal Swedish Opera in Stockholm in 1978, as well as in Hamburg and Paris. For the British stage premiere of Le Grand Macabre at the London Coliseum in 1982, Howarth wrote an analysis of the text and music for Opera magazine. He later reflected that "no one in Stockholm realized how inexperienced" he was and he didn't tell them. He recalled "I never thought I'd get into opera, because I don't play the piano. I knew I had a natural technical ability, but I was naive about other things... I was never assistant conductor to anybody, so I didn't know how far ahead you had to plan, how many string rehearsals you would need, whether it would be OK for the first oboe not to come to the first rehearsal". He later conducted the premieres of four operas by Harrison Birtwistle: The Mask of Orpheus at the ENO (1986), Yan Tan Tethera for Opera Factory (1986), Gawain at the Royal Opera House (1991) and The Second Mrs Kong at Glyndebourne (1994). He conducted the first performance of Phaeton, a one-act opera by Alan Ridout on Radio 3 in March 1977. Following Le Grand Macabre he made his debut in Gothenburg in 1979 with Peter Grimes and a year later with Australian Opera with Boris Godunov.

He was Principal Guest Conductor of Opera North from 1985 to 1988 where he led the UK premiere of Carl Nielsen's Maskarade in 1990; and the premiere of the Mozart pasticcio The Jewel Box in 1991; he served as music advisor to the company from 2002 to 2004. At Glyndebourne (and on tour with the company) he conducted Rossini's Il Barbiere di Siviglia and Verdi's Falstaff in 1981, Nigel Osborne's The Electrification of the Soviet Union in 1987 and 1988, and Birtwistle's The Second Mrs Kong in 1994 and The Last Supper in 2000 and 2001. In Paris he conducted the premiere of Erzsébet by Charles Chaynes in 1983. Drawing on his connection with Kempe, Howarth conducted several Strauss operas including Die Liebe der Danae, Arabella, Capriccio, Daphne and Die ägyptische Helena.

He first appeared at the Proms in 1970 in a late-night concert of music by Mike Ratledge of the experimental rock band Soft Machine, Terry Riley and Tim Souster. He performed there 23 times until 1989, conducting several UK and world premieres.

As a devoted advocate of contemporary music, Howarth gave the premieres of many instrumental works, including Domination of Black by Robin Holloway (symphonic poem for large orchestra, 1974), Orchestra by Morton Feldman (1976), Inner Light 2 by Jonathan Harvey (singers, 12 players and tape, 1977), La Terre est un homme by Brian Ferneyhough (orchestra, 1979), Invenzioni by Aribert Reimann (for twelve instruments 1979), Nadira by Philippe Capdenat (for soprano, speaker, choir and orchestra, 1983), Waarg by Iannis Xenakis (for thirteen instruments, 1988), Scene by Hans-Jürgen von Bose (for chamber orchestra, 1991), and Tom-a-Bedlam by Detlev Müller-Siemens (voices and chamber orchestra, 1991). Alongside Philip Jones, Howarth played in the "hair-raisingly difficult" premiere of Iain Hamilton's Circus, for 2 trumpets and orchestra given by the London Philharmonic Orchestra in 1969.