Iti Mrinalini (Bengali: ইতি মৃণালিনী English: Yours, Mrinalini; English: An Unfinished Letter) is a 2011 Indian drama film directed by Bengali filmmaker Aparna Sen. Sen collaborated with Ranjan Ghosh to write both the story and the screenplay. The film was produced by Shrikant Mohta and Mahendra Soni of Shree Venkatesh Films Pvt Ltd. Some critics consider it to be among her best works, ranking with Mr. and Mrs. Iyer and 36 Chowringhee Lane.

This was the first Bengali film Sen directed after a gap of more than a decade. Her previous film was Paromitar Ek Din, in 2000. Iti Mrinalini is viewed as the director's first mainstream venture. It focuses on the life of an aging Bengali star actress of yesteryear (Mrinalini), who looks back at her life. Aparna Sen plays the current-day Mrinalini while her daughter Konkona Sen Sharma portrays Mrinalini's younger self. The film also stars Rajat Kapoor, Priyanshu Chatterjee, Kaushik Sen, Locket Chatterjee and German actor Suzanne Bernert in supporting roles. The entire cast, except for Konkona, is new to Aparna Sen films.

This was the first time Sen had collaborated with a scriptwriter, and the first film by Sen to be nationally released in Hindi simultaneously with the Bengali version. It is also the first time Sen and her daughter have played the same character.