John Peter Farnham AO (born 1 July 1949) is a British-born Australian singer. His career has mostly been as a solo artist, although he replaced Glenn Shorrock as lead singer of Little River Band from 1982 to 1985.

Farnham has become one of his country's best-known and most popular performers, and he is the only Australian artist to have a number-one record (album or single) in five consecutive decades (echoing that of Cliff Richard in the UK), with singles including "Sadie (The Cleaning Lady)" in 1967, "Raindrops Keep Fallin' on My Head" in 1970, and "Age of Reason" in 1988; and albums Whispering Jack in 1986, Age of Reason in 1988, Chain Reaction in 1990, Then Again... in 1993, 33? in 2000, and The Last Time in 2002.