Al-Ustaj Umbra Amiril Kato (c. 1946 – 14 April 2015) was the founder of the Bangsamoro Islamic Freedom Fighters (BIFF) a group which seceded from Moro Islamic Liberation Front (MILF). He joined the MILF after 1985, after he graduated from Imam Muhammad bin Saud Islamic University in Riyadh, Saudi Arabia. Umbra Kato was the Philippine's most wanted man though due to his still official membership in the MILF he is not hunted by the military. However a warrant of arrest was filed against him together with other BIFF members by the Philippine National Police. The Armed Forces of the Philippines, with the MILF, launched Operation Darkhorse in a bid to arrest him in January 2014.

Kato reportedly died on 14 April 2015 of a heart attack. BIFF spokesperson Abu Misry Mama, confirmed his death after he was informed by Kato's son that he died in 2:00 am due to complications from pneumonia. He was reported to have died in Barangay Kateman in Guindulungan, Maguindanao but this was denied by the barangay chairman.