Reliance Infrastructure-promoted Reliance Aerostructure would have 51 per cent stake in the entity.
The joint venture would be known as 'Thales Reliance Defence Systems'.
In a tweet today, the Competition Commission of India (CCI) said it has approved the formation of joint venture between Reliance Aerostructure Ltd and Thales India Pvt Ltd.
Deals beyond a certain threshold require the fair trade regulator's clearance.
The proposal to set up the joint venture was announced in June 2017.
"Leveraging Thales offset commitment as part of the Rafale contract, the joint venture is to develop Indian capabilities to integrate and maintain the radar and electronic warfare sensors," a joint statement from the companies had said last year.