Singh along with his supporters joined the party at the Karnataka Pradesh Congress Committee office here in the presence of Chief Minister Siddaramaiah, party state President G Parameshwara, campaign committee chief and Minister D K Shivakumar.
After quitting BJP, Singh had said he was fed up with the "squabbling and bickering" in the party.
Speaking to reporters, Singh said he has joined the Congress accepting its principles, and that the party represents the country's future.
Siddaramaiah said Singh has left BJP and joined the Congress as there was "no place for secular principles there."
Singh represented Vijayanagara assembly constituency in Ballari district.
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