Princess Stéphanie of Monaco (Stéphanie Marie Elisabeth; born 1 February 1965) is the youngest child of Rainier III, Prince of Monaco, and American actress Grace Kelly. She is the younger sister of Albert II, Prince of Monaco, and Caroline, Princess of Hanover.

Currently 14th in the line of succession to the Monegasque throne, she has been a singer, swimwear designer and fashion model. Stéphanie was born to Rainier III and Grace Kelly on 1 February 1965 at Prince's Palace in Monaco. She is the youngest of their three children, after Caroline and Albert II.