Surat Kecil untuk Tuhan (phrasal translation: A Diary of Letters to God) is a 2011 Indonesian biographical drama film directed by Harris Nizam. The film stars Dinda Hauw and Alex Komang, it follows a young girl's struggle with cancer. It was the best-selling Indonesian film of 2011.

Keke (Dinda Hauw) is a young girl with a loving father (Alex Komang) and mother, as well as loyal friends. She is diagnosed with Rhabdomyosarcoma (a cancer of connective tissues), which is unusual at her age. After undergoing twenty-five sessions of chemotherapy, the once healthy and beautiful Keke finds herself sickly and bald, with a disfigured face. Although the treatment initially works, the cancer returns a year later.

Doctors estimate that Keke has three months to live. To help her deal with her pain, she begins keeping a diary; through her writing she finds the strength to hold on for a year. As she begins to accept her fate, she writes a letter to God in her diary, asking that her family be kept safe.

• Dinda Hauw as Keke
• Alex Komang as the Father

Surat was based on the true story of Gita Sesa Wanda Cantika, a 15-year-old student who was diagnosed with and on 25 December 2006 died of the first reported case of Rhabdomyosarcoma in Indonesia. The story had been reported in 2009 by a pair of bloggers known as Agnes and Davonar. These blog posts were widely read and later novelised under the name Surat Kecil untuk Tuhan;^[1] the novelisation sold 350,000 copies.^[2][3]

Surat was the feature film debut of Dinda Hauw.^[1] Most of the cast and crew were relatively unknown; Alex Komang was the main exception.^[2] The film was produced by Sarjono Sutrisno, of Skylar Pictures.^[3]

Surat was released on 7 July 2011 after a press screening on two days earlier.^[3] It was the most-viewed Indonesian film of the year, seen by more than 750,000 people.^{[lower-alpha 1][5]} This was down from previous years.^[5]

Indah Setiawati, writing for The Jakarta Post, described Surat as a "heartwarming movie about spirit, family and friendship" that would make audiences cry, despite some technical deficiencies.^[1]

Surat was nominated for three Citra Awards at the 2011 Indonesian Film Festival. It did not win any.^[6] At the 2012 Indonesian Movie Awards, the film won Best Newcomer for Dinda Hauw.^[7]