Tilak Janaka Marapana PC (born August 1942) is a Sri Lankan lawyer.

He retired as Attorney General in 1995, following the change of the United National Party Government, reverting to the Unofficial Bar.

In 2015, he was reappointed Member of Parliament from the national list and was appointed Cabinet Minister of Law and Order, Prison Reforms in September 2015.

[2] He resigned from the post in November 2015 after a speech he made in Parliament regarding the legal position of the Avant Garde controversy.

He was also appointed for the post of Minister of Foreign Affairs on August 15, 2017 after the resignation of Ravi Karunanayake.