Mathurage Don Kusal Janith Perera (মাথুরেজ ডন কুশল জানিথ পেরেরা), is a professional Sri Lankan cricketer currently plays limited overs cricket and a former ODI cricket captain. He was a key member of the 2014 ICC World Twenty20 winning team.

Perera married his longtime partner Kelani on 3 March 2020 at the Water's Edge hotel, Battaramulla. Having represented the Sri Lanka Police cricket team that won joint champion status in the 2023 Sri Lanka Cricket first-class competition, Perera was appointed to the police service in the rank of chief inspector of police (CIP).

Educated at Kottawa Dharmapala Maha Vidyalaya, and Royal College Colombo, he has represented the latter in the prestigious Royal–Thomian annual cricket encounter. Even though Kusal was a right-handed batsman at the younger age of 11 to 13 years, he later switched his stance to become a left-handed batsman. This switch has been influenced by the batting stance of the Sri Lankan legend, Sanath Jayasuriya - his childhood idol and hero.

Perera was a part of a 15-man squad that toured Australia in January 2013. He made his One day international debut against Australia in the 2nd ODI on January 13, 2013, replacing the injured Dinesh Chandimal, where he came to bat on number 4 and scored an unbeaten 14 from 16 balls before Sri Lanka won by 8 wickets.

Perera made his T20I debut in the first T20I against Australia in January 2013 and scored 33 from 22 balls before getting caught behind off Australian all rounder, Glenn Maxwell. In this match he hit some aggressive shots and many compared him with Sanath Jayasuriya.

On 31 March 2013, T20I match during Bangladesh tour of Sri Lanka, Kusal Perera scored his maiden T20I half century. He scored 64 from 44 balls hitting five boundaries and four sixes. Sri Lanka won the match by 17 runs and Kusal Perera won man of the match award for his performance.

On 21 November 2013, New Zealand tour of Sri Lanka, Kusal Perera scored his second T20I half century. While chasing the target of 142 runs, Perera scored 57 runs from 37 balls hitting six boundaries and two sixes. Finally Sri Lanka won the match by 8 wickets and Kusal Perera won the man of the match award for his performance.