"Aren't beautiful young women more attractive in at least some fashionable clothes?", the 83-year-old head of News Corp - the Sun's parent company - tweeted.
"Brit feminists bang on forever about Page 3. I bet never buy paper I think old fashioned but readers seem to disagree," he added.
Murdoch also hinted at ending Page 3 on Twitter in February last year, the BBC reported.
The Sun has carried pictures of topless models since 1970, it said.
In August last year, the Sun's Irish edition stopped running topless pictures on page 3 because of what the editor called "cultural differences" between the UK and Ireland.
The Sun is the UK's best-selling newspaper, with an average Monday-Saturday circulation of over two million copies a day.