The elevation of Singh, who earlier held the position of chief business officer at REL, comes with immediate effect.
He has replaced interim Group CEO Nalin Nayyar, a company statement said.
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He will continue to oversee all strategic initiatives across the group in partnership with operating management, the company said.
Maninder was previously associated with Ranbaxy Laboratories for 27 years. A graduate from Shri Ram College of Commerce, Delhi University, he is a chartered accountant from ICAI.
REL Non-Executive Chairman and Non-Executive Vice-Chairman Malvinder Mohan Singh and Shivinder Mohan Singh said the group will continue to progress well on its stated strategic path under Maninder.
Religare Enterprises offers financial services ranging from SME loans, affordable housing finance, health insurance, capital markets and wealth management solutions.
Stock of REL closed 1.5 per cent down at Rs 219.65 on BSE.