Marc Douglas Chan Cagas IV (born April 24, 1976) is a Filipino politician.

Cagas lost the election to the Liberal Party candidate, former Congressman Claude Bautista.

Justice Secretary Leila De Lima revealed over ANC that former congressmen Douglas Cagas and his son Marc Douglas Cagas IV of Davao del Sur (1st District) and Arrel Olaño of Davao del Norte (1st District) were among those charged after they were found to have channeled their Pork Barrel Funds to non-government organizations (NGOs) controlled by suspected pork barrel scam mastermind Janet Lim-Napoles between 2007 and 2009.

June 10, 2021, his father Douglas Cagas, died due to complications of COVID-19 virus.

Hence, he and his cousin, John Tracy, a board member, took over the offices of governor and vice-governor, respectively.