The broadcaster, who is about to launch her own show Katie, told SheKnows that the Duchess of Cambridge would be her dream interviewee.
"I think it would be really interesting to interview Kate Middleton, because I think she has comported herself so well since she has been thrust in the limelight," Couric said.
However, she added: "I think she needs to eat more because she's so thin."
Couric also revealed that Audrey Hepburn is her favourite past interview subject, describing the Breakfast At Tiffany's star as "one of the most elegant and charming and gracious people" she's ever spoken to.
"[She] went around the whole studio and introduced herself to every cameraman, every member of our technical crew, every production assistant," she said. "She was just so gracious."
Katie, which will feature guests such as Jessica Simpson and Jennifer Lopez, will premiere on September 10.