Ariel Oliva Querubin (born 1957) is a former Philippine Marine Corps colonel who took part in the seven-hour Fort Bonifacio Standoff in protest of the alleged voluntary relief of his commandant Maj. Gen. Renato Miranda in 2006. Querubin and several officers also protested against the 2004 presidential elections, which they claimed was “marred by fraud.” Querubin and several others are currently detained in Camp Aguinaldo for the alleged attempt to unseat President Gloria Macapagal-Arroyo 
Querubin was born in Pangasinan, raised in La Union, and educated in Manila. He graduated from the Philippine Military Academy (PMA) in 1979, completed the Australian command and staff course, and received his master's degree in defense studies from the University of Canberra.
He is married to Maria Flor Palacio Azcarraga and has seven children.
Querubin is acclaimed as the most bemedalled officer in Philippine history, earning practically every award that the Armed Forces could give, except the Wounded Personnel Medal, which he could have received in 1989 had he been on the government side during the December coup attempt against the Aquino administration. Querubin was a co-founder of military fraternity Young Officers' Union, an arm of Reform the Armed Forces Movement (RAM), which was among the 3,000 rebel troops that staged the coup.
Four years after his PMA graduation, Querubin was promoted to the rank of captain. He became a major in 1997.
Querubin was instrumental in:
- The neutralization of Jessie Rafael, provincial chair of Communist Party of the Philippines-New People's Army (CPP-NPA) in Abucay, Bataan in 1981;
- The neutralization of four Moro National Liberation Front (MNLF) leaders in Southern Palawan in 1983;
- The rescue of Swiss national Hans Kunsli in Luuk, Sulu in 1986;
- The neutralization of MNLF leader Racquel Carreon in Brooke’s Point, Palawan and CPP-NPA commander Ka Ninong in Aborlan, Palawan in 1988;
- The neutralization of Barahama Sali that led to the release of Fr. Cirilo Nacorda in 1994;
On 18 March 2000, then Lieutenant Colonel Querubin commanded a Marine battalion landing team in a 24-hour crossfire against around 800 fully armed men of the Moro Islamic Liberation Front (MILF) in Kauswagan, Lanao del Norte. His group broke the last line of MILF's stronghold that resulted in the capture of Camp John Mack, considered as the rebels' most strategic staging area for operations.
- Medal of Valor, AFP’s highest award given to a soldier for heroism, gallantry in action and sacrifice beyond the call of duty.
- One Distinguished Conduct Star (2nd highest award in combat)
- Two Distinguished Service Stars
- Seven Gold Cross (3rd highest award in combat)
- Two Gawad sa Kaunlaran
- One Bronze Cross Medal
- 12 Military Merit Medals
- AFP Parachutist Badge
- Tawid Award
- Cavalier Award, award given by mistahs (classmates and peers) in PMA for outstanding performance in naval operations
- Saranay Award, highest award given by the province of La Union to its outstanding citizens
- Silver Wing Medal
- Military Commendation Medal
- Parangal sa Kapanalig ng Sandatahang Lakas ng Pilipinas
- Military Civic Action Medal
- Sagisag ng Ulirang Kawal
- Long Service Medal
- United Nations Service Medal and Ribbon
- UN Transitional Administration in East Timor Medal
- Anti-Dissidence Campaign Medal and Ribbon
- Luzon Anti-Dissidence Campaign Medal and Ribbon
- Mindanao Anti-Dissidence Campaign Medal and Ribbon
- Disaster Relief and Rehabilitation Operation Ribbon
- Combat Commander’s (KAGITINGAN) Badge
- Marine Command Badge
- Marine Silver Command Badge
- Presidential Unit Citation Badge
- People Power II Ribbon
- Marine Combat Physical Fitness Badge (Gold)
- Philippine Marine Corps Plaque
2010 senatorial bid
The former military man filed his certificate of candidacy for senator under the Nacionalista Party on 30 November 2009, Bonifacio Day, in honor of the Father of the Philippine Revolution Andres Bonifacio. Querubin was deemed retired upon formalizing his bid.
- Who is Col. Ariel Querubin? Philippine Center for Investigative Journalism (accessed 15 March 2010)
- About Ariel (accessed 15 March 2010)
- Col. Ariel Querubin (accessed 15 March 2010)
- Awards (accessed 15 March 2010)
- Col. Ariel Querubin to file Senate candidacy, to end military service in simple ceremony (accessed 15 March 2010)
- ^ "Who is Col. Ariel Querubin?," Philippine Center for Investigative Journalism (accessed 15 March 2010)