The TV presenter will make her appearance alongside three other new faces when the show returns next week.
Former X Factor judge Sharon Osbourne, Penny Lancaster and Gloria Hunniford will also be appearing on the famous talk show panel.
Judy, 66, said about her return to day time television: “I know I said I wouldn’t go back, but actually I’m looking forward to occasionally contributing to lively conversations between a group of outspoken and intelligent women.”
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Alongside husband Richard Madeley, Judy became a household name when she hosted This Morning between 1988 and 2001.
As recently as last month, Richard claimed the couple had no plans to return to TV presenting.
"When we stopped, we agreed we never wanted to do that again," he said.
"Judy has completely withdrawn from broadcasting. She’s not interested in going back to any other series. She’s now a full-time writer and halfway through her second novel.”
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Sharon Osbourne, meanwhile, has spoken about her new role on the hit TV show, saying: “The last time I was a Loose Woman earlier this year I had such a ball with the other panellists and the audience I can’t wait to do it again.
“It’s refreshing to be able to talk about real issues with other women while having a great laugh at the same time.”