Neethikku Thandanai (Tamil: நீதிக்கு தண்டனை) is a 1987 Indian Tamil film, directed by S. A. Chandrasekhar and produced by S. S. Neelakantan and Shoba Chandrasekhar. The film stars Raadhika, Nizhalgal Ravi, Charan Raj and Senthil in lead roles. The film had musical score by M. S. Viswanathan. The film was remade in Telugu as Nyayaniki Siksha.
The movie opens with murder of a Doctor who tries to set up his medical practice in a village. Everyone knows that the Zamindar of that village is behind that murder. He doesn't like the villagers to get exposed to better things, as he fears they might get out of his control. Enters Dr. Santhi (Radhika), who is determined to complete her father’s incomplete dream. She meets Chiru, who will be very helpful and co-coperative to her. But, zamindar has his own cruel intentions. He plans to kills Dr. Santhi also, but Chiru saves her. Every attempt on her life is foiled by Chiru and in the end Chiru manages to help Dr.santhi to run her practice smoothly by bringing zamindar to justice.
Vijayakanth (Vijayakanth), an honest C.I.D inspector, is married to Seetha (Seetha) and they have a daughter Shamili (Shamili). Vijayakanth has enough evidences to arrest the dangerous criminal Tiger (Charan Raj). Vijayakanth befriends Rekha, a C.I.D inspector, without knowing that she is Seetha's friend. Seetha compels Rekha to live with them. Seetha has the blood cancer but she hides to her husband. When her husband and her friend know this news, they decide to go in U.S.A for the treatment but Tiger manages to kill Seetha and erases the proofs. Vijayakanth is now more determined to catch Tiger.