Ran Dedunnak (The Rainbow) (Sinhala: රන් දේදුන්නක්) is a 2016 Sri Lankan Sinhala masala film directed by Nalin Rajapakshe and produced by Raja Balasooriya for Moonlight Films. It stars Roshan Ranawana and newcomer Tanasha Satharasinghe in lead roles along with Rex Kodippili and Kumara Thirimadura. Music composed by Udaya Sri Wickramasinghe.^{[1][2][3][4][5]} It is the 1259th Sri Lankan film in the Sinhala cinema.^[6]

Story revolves around a young man named Roshan who comes to Colombo in search of life and encounters dashing lass in the city who happens to be a journalist. The female journalist who named Nishani is caught in a drug haul that she has been trying to expose to the public via media. King Pin of the drug mafia is on the hunt for the female journalist. In the midst of this controversy she encounters her lover to be, the young macho man who comes to town out of the blues.

• Roshan Ranawana as Roshan
• Tanasha Satharasinghe as Nishani
• Rex Kodippili as Minister Weerarathne
• Kumara Thirimadura as Victor
• Nadeeka Gunasekara as Shiva's mother
• Mihira Sirithilaka as Bala
• Raneesh Shyamanga as Shiva
• Shanudrie Priyasad as Rashmi
• Susila Kottage as Woman at gym
• Nilmini Kottegoda as Woman at gym
• Wasantha Kumaravila as Mark
• Dinakshie Priyasad as Roshan's sister
• Raja Ganeshan as Shiva's father
• Dayasiri Hettiarachchi as Roshan's father
• D.B. Gangodathenna