Besides Patkar, the septuagenarian social activist also extended support to Raju Shetty and Sadabhau Khot, leaders of Swabhimani Shetkari Sanghatna (SSS), one of the constituents of BJP-led "Mahayuti" (grand alliance).
While Patkar is contesting from Mumbai North-East seat, Shetty and Khot are in the fray from Hatkanangale and Madha seats, respectively, in western Maharashtra.
"These are among few candidates contesting on the behalf of parties having strong credibility," Hazare told PTI at his native Ralegan Siddhi village.
"I am against the system of contesting polls on party basis because most of the political parties are functioning on black money of anti-social elements and cannot be trusted for wellbeing of the nation," he said.
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Hazare praised Patkar for working for the rights of tribals in Maharashtra, Gujarat and Madhya Pradesh, and for uplift of slum dwellers.
"Medha successfully fought battles like 'Lavasa scam'. She is also supporting the movement against corruption and for Jan Lokpal Bill since long," the Gandhian said.
He hailed Shetty and Khot for "awakening" farmers in the state. "They have awakened farmers in the state and made them aware about the grave injustice done by government and sugar barons..Shetty and Khot have also solved some of the basic problems of farmers," he said.