Manohar Parrikar was on born 13 December 1955 in a Gaud Saraswat Brahmin family at Mapusa, Goa.
He studied at Loyola High School, one of the most reputed schools of his time. He completed his secondary education in Marathi and went on to graduate in metallurgical engineering from IIT Bombay in 1978.
Parrikar joined the Rashtriya Swayamsevak Sangh (RSS) at a young age and became a Chief instructor. After graduating from IIT, he resumed RSS work in Mapusa while maintaining a private business.
He was active in the RSS's North Goa unit, becoming a key organiser of the Ram Janmabhoomi movement.