Harald Hörth was born on March 29, 1969 in Zwettl and was given basic musical training in piano and clarinet from his brother, Reinhard. Although he achieved success as a clarinetist early on, winning the first prize at "Jugend musiziert", he changed instruments in 1984 and took up the oboe, studying at what was, at the time, the College of Music and Performing Arts in Vienna under Manfred Kautzky and Klaus Lienbacher. In 1992 he completed his diploma with distinction, and continued his studies with Günter Lorenz and attended master classes offered by Hansjörg Schellenberger and Heinz Holliger. This intensive work enabled him to launch an impressive orchestral career.  Hörth was principal oboist with the Vienna Chamber Orchestra (1989-1991), with the Vienna Radio Symphony Orchestra (1991-1994) and the Vienna Symphony (1994-2004). Following a successful audition, he began his work as principal oboist with the Vienna State Opera Orchestra on September 1, 2004. In 2007 he became member of the Vienna Philharmonic Orchestra.

Parallel to his orchestral career, Harald Hörth, who in 1987 passed his Matura exams at the Academic High School in Vienna, appeared as soloist with the Vienna Symphony, the Austrian-Hungarian Haydn Philharmonie, the Vienna Chamber Orchestra and the Graz Symphony, in addition to playing with various chamber music groups (Ensemble Kontrapunkte, Ensemble "die Reihe", Lenau Quintet, Vienna Oboe Trio, "quintet wien").

From 2000-2008, Univ.-Prof. Harald Hörth served on the faculty of the Vienna Conservatory private university, as well as the Prague-Vienna-Budapest International Summer Academy boarding school.

Within Austria, Hörth has taught at the International Orchestral Institute Attergau (a project of the Vienna Philharmonic), as well as the iconic Salzburg Festival. Hörth is also in high demand to teach internationally. He has presented guest masterclasses at some of the most prestigeous festivals and institutions in the world, including the New World Symphony Orchestra (Miami, USA), the Pacific Music Festival (Sapporo, Japan), and at the Juilliard School (New York, USA).

Univ.-Prof. Harald Hörth joined the faculty at the University for Music in Vienna in 2008, where he currently teaches.