Lucas “Luke” Purugganan Bersamin is a Filipino lawyer and jurist who currently serves as the 40th Executive Secretary of the Philippines. Bersamin previously served in the Supreme Court of the Philippines for 10 years, first as an associate justice from 2009 to 2018 and then as the 25th Chief Justice of the Philippines from 2018 until his retirement in 2019. He was named by President Gloria Macapagal Arroyo to the high court as an associate justice on April 2, 2009. Prior to becoming an associate justice, he was a member of the Court of Appeals.

The Supreme Court (Filipino: Kataas-taasang Hukuman; colloquially referred to as the Korte Suprema, is the highest court in the Philippines. The Supreme Court was established by the Second Philippine Commission on June 11, 1901 through the enactment of its Act No. 136, an Act which abolished the Real Audiencia de Manila, the predecessor of the Supreme Court.