Andha Naal (English: That Day, pronounced [an̪da naːɭ]) is a 1954 Indian Tamil-language mystery-thriller film, produced by A. V. Meiyappan and directed by S. Balachander. It is the first film noir in Tamil cinema, and the first Tamil film to be made without songs, dance, or stunt sequences. Set in the milieu of World War II, the story is about the killing of a radio engineer Rajan (Sivaji Ganesan). The suspects are Rajan's wife Usha (Pandari Bai), the neighbour Chinnaiya Pillai (P. D. Sambandam), Rajan's brother Pattabi (T. K. Balachandran), Rajan's sister-in-law Hema (Menaka), and Rajan's mistress Ambujam (K. Sooryakala). Each one's account of the incident points to a new suspect.

Balachander watched Akira Kurosawa's Rashomon (1950) at a film festival, was inspired by it and wrote a play in the same narrative style, but the script was rejected by All India Radio; Meiyappan later agreed to produce it as the film that would later be titled Andha Naal under AVM Productions. The screenplay was written by Javar Seetharaman, who also played a prominent role as an investigative officer in the film. The cinematography was handled by S. Maruti Rao, and the background score was composed by AVM's own music troupe, Saraswathy Stores Orchestra. The film was shorter than most contemporaneous Tamil films. It was the only film directed by Balachander for AVM.

Andha Naal was released on 13 April 1954, on the eve of Puthandu (Tamil New Year). It was critically acclaimed and was awarded a Certificate of Merit for Second Best Feature Film in Tamil at the 2nd National Film Awards in 1955. Despite being a commercial failure at the time of its original release, it has acquired cult status over the years and is regarded as an important film in Tamil cinema. In 2013, Andha Naal was included in News18's list of the "100 Greatest Indian Films of All Time".