Alfonso Tomas Pagaduan Araullo (born October 19, 1982 in Quezon City, Philippines), better known as Atom Araullo, is a news reporter of ABS-CBN News and Current Affairs shows like Umagang Kay Ganda, TV Patrol World and Bandila. He is also a contributor to Studio 23's Y Speak.

Born to an activist family, Araullo spent most of his early childhood days with his parents battling it out during the Marcos dictatorship. This has exposed him to the political struggle in the country. During his early elementary school days, his parents exposed him to sports and the theater. As a result, he became part of several plays and has joined various competitions as a triathlete.

He finished his elementary education at the Ateneo de Manila, and his high school education at the Philippine Science High School. Araullo graduated with a Bachelor of Science degree in Applied Physics from the University of the Philippines (Diliman Campus). There he became a member and chairperson of the League of Filipino Students (LFS), as well as education research officer of Student Alliance for the Advancement of Democratic Rights - UP (STAND-UP). He also won as Councilor in the UP Diliman University Student Council elections of 2003, garnering the highest number of votes. He ran as the student council Chairperson the next year, but lost by a few hundred votes.^{[citation needed]}