Rowling, who wrote the best-selling books, previously said this was the end of the series.
But after being moved by the thousands of fans who had travelled from all over the world for last night's London premiere of Harry Potter And The Deathly Hallows Part 2, she hinted she might write another instalment.
Rowling teased: "Well if Dan (Daniel Radcliffe) phones me and begs in 10 years I'll bang out a script for him. But I'm not thinking that's going to happen."
One of the film's new stars, Arthur Bowen, held out some hope a new generation might keep the stories going, saying: "We'll have to ask Jk Rowling to write another book. We can ask her."
In the video below, the stars reflect on the blockbuster film series and what they will miss most.
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