Earlier, the party hinted at fielding its own candidates in the Karnataka polls.
"All our efforts and endeavour would be to ensure that the JDS gets maximum number of seats. (HD) Kumaraswamy should become the chief minister and the party led by Deve Gowda should be ruling Karnataka," Mr Owaisi said.
Mr Kumaraswamy is son of Deve Gowda, and is the president of Karnataka unit of the JD(S).
According to Mr Owaisi, his party feels that both national parties, the BJP and Congress, have failed to live up to the expectations and hope of the people of Karnataka and that's why they have decided to support the JD(S) completely. "We will not be putting up our candidates," he said.
Mr Owaisi said he has already spoken to Mr Kumaraswamy and assured him about his party's support to the JD(S).
He said his party members, including him, would go out and address public meetings to garner support for the JD(S) in the upcoming elections. "I hope people of Karnataka would once again repose faith in the JDS so that a qualitative change can be brought in Karnataka," the AIMIM leader said.
"It's in the interest of Karnataka and in the interest of the nation that a non-Congress, non-BJP government comes to power both in Karnataka and subsequently (at the centre) whenever the parliamentary elections are held," he added.
The All India Majlis-E-Ittehadul Muslimeen (AIMIM) has seven members in the Telangana assembly.
Telangana Chief Minister K Chandrasekhar Rao during his visit to Bengaluru last week, while seeking the JD(S) support on his proposal to make a federal front, also announced his party's support to the JD(S).
Karnataka is seeing a three-corner fight with the Congress, BJP and the JD(S) in the fray. The result will be out on May 15.