Whispering Jack is the twelfth studio album by Australian adult contemporary pop singer John Farnham. It was produced by Ross Fraser and released on 29 September 1986, peaking at No. 1 on the Australian Kent Music Report albums chart. Whispering Jack became the second-best-selling album in Australia, behind only Meat Loaf's album Bat Out of Hell, and the highest-selling album in Australia by an Australian artist―24× platinum, indicating over 1.68 million copies sold; it remains the third-best-selling album of all time in Australia, as Shania Twain's Come On Over eventually eclipsed it. It spent 25 weeks at the No. 1 spot on the albums chart during 1986–1987, it was awarded the 1987 ARIA Award for Album of the Year, and it was the best-charting album for the decade of the 1980s in Australia. It was the first Australian-made album to be released on compact disc within Australia. One of Farnham's biggest hits, "You're the Voice", was issued as the lead single from the album and peaked at No. 1 on the Kent Music Report singles chart.

John Peter Farnham AO is a British-born Australian singer. Farnham was a teen pop idol from 1967 until 1979, billed until then as Johnny Farnham. He has since forged a career as an adult contemporary 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.