The director's third and final instalment, The Dark Knight Rises, comes out this summer, and according to Nolan it will be his final Batman film.
Deadline reports that during a recent movie conference Nolan said he had no plan for his sequels, saying: "We never had a specific trajectory. I wanted to put everything into making one great film, I didn't want to hold anything back."
Batman Begins starred Christian Bale, Morgan Freeman and Michael Caine, who are all returning for the final movie, along with newcomers Tom Hardy, Anne Hathaway and Joseph Gordon-Levitt.
Bale recently revealed that if Nolan did decide to make a fourth film in the series, he would be open to starring in it.
The Dark Knight Rises is scheduled for a July 20 release in the UK and the US.
Watch a trailer for The Dark Knight Rises below: