Gregorio Ballesteros Honasan II (born March 14, 1948), better known as Gringo Honasan, is a Filipino political figure. He played a key role in the 1986 EDSA Revolution that toppled the dictatorship of President Ferdinand Marcos. He led a series of coup attempts against the administration of Corazon Aquino. President Fidel Ramos granted him amnesty in 1992. He entered politics and became a senator from 1995 to 2004 and again since 2007.

Gregorio Honasan was born in Baguio City to Colonel Romeo Honasan and Alice Ballesteros, both from Sorsogon province. Honasan spent his elementary days at San Beda College from Kindergarten to Grade 6. After which, he went to Taiwan and studied at the Dominican School, Taipei, Taiwan. He then returned to the Philippines and finished his high school at Don Bosco Mandaluyong. He attained his Bachelor of Science degree at the Philippine Military Academy, where he received the title of "Class Baron", the academy's highest leadership award.

After graduating in 1971, he joined the Philippine Army and went into combat duty against separatist and communist insurgents in Luzon and Mindanao. He was wounded in action at battles in Lebak and Jolo. Making his way up through the armed forces, he became aide-de-camp to Secretary of National Defense Juan Ponce Enrile in 1974, and later became the department's Chief of Security.