What is the name of Queen's first album to reach number one in the UK?

Queen’s first album to reach number one in the UK was A Night at the Opera.

Released in 1975, the album was Queen’s fourth studio record and was produced by the band with Roy Thomas Baker. Its elaborate sound combined hard rock, progressive rock, music hall, balladry and theatrical vocal arrangements. The record was named after a Marx Brothers film and became famous for its ambitious studio production.

Its best-known track, “Bohemian Rhapsody,” was also a UK number-one single. The song’s unusual length and multi-section structure made it an unlikely hit, but its promotion and repeated radio play helped establish Queen as international stars. The album topped the UK Albums Chart for four non-consecutive weeks.

A common mix-up is confusing the album with Sheer Heart Attack, the immediately preceding 1974 record that helped Queen break through commercially. News of the World came later, in 1977, and Jazz followed in 1978. A Night at the Opera was the key milestone: it gave Queen their first UK number-one album and their first UK number-one single.