He joined the BJP at a programme in the presence of party chief Amit Shah and other key leaders.
Praising Prime Minister Narendra Modi and Shah, he said "they have taken the country to great heights."
"I am grateful today that I am joining the party which was led by the great leaders. I see great India emerging under the leadership of Prime Minister Narendra Modi and ably supported by the party President Amit Shah," he told reporters after joining the party.
Earlier this year, Krishna has resigned from the Congress and also served as the Karnataka Chief Minister between 1999 and 2004.
He had also served as the Maharashtra Governor and even had a stint as the country's external affairs minister during the UPA government.
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