"I joined the BJP as I was influenced by the ideology of Prime Minister Narendra Modi. I do not know anything about the ideology of Chief Minister Naveen Patnaik," Ms Ray said in an apparent dig at the chief minister.
The BJP is happy to have Ms Ray in the party, Dharmendra Pradhan said, adding she will help in strengthening the party's base in the state.
Two other popular Odia actors Mihir Das and Anu Choudhury had joined the BJP last month.
Ms Ray, one of the acclaimed actors of Odia film industry, has worked in Bengali films too.
Mahasweta Ray, who was awarded the 'Best Performing Actress Award' for her performance in 'Dele Dhara Katha Sare', said she had expected an award for her other film 'Chini'.
The 55-year-old actor made her debut in 1976 with 'Sesha Shrabana'.
Get Breaking news, live coverage, and Latest News from India and around the world on NDTV.com. Catch all the Live TV action on NDTV 24x7 and NDTV India. Like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.