Dato Henry Sum Agong (born 18 February 1946) is a Malaysian politician.
He is the Member of Parliament of Malaysia for the Lawas constituency in Sarawak, representing the Parti Pesaka Bumiputera Bersatu (PBB) in the state-governing but federal opposition Sarawak Parties Alliance (GPS) coalition.Having represented the Bukit Mas constituency, Henry Sum moved to the seat of Lawas for the 2008 election, which he won with 92% of the vote.