The 'Naada Dwaja' (state's flag) in hues of yellow, white and red, has the state's emblem 'Gandaberunda' or the two-headed mythological bird, at its centre.
A committee formed by thestate government last year had recommended the separate flag for Karnataka,discounting any constitutional or legal hurdles for it.
Siddaramaiah unveiled the flag after chairing a meeting of pro-Kannada organisations, activists and literary personalities, where they unanimously approved the design.
It was decided to have a flag for thestate as a symbol of pride of Kannada speaking people, he said,adding "it was the intention, opinion and voice of Kannadigas."
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Calling the state flag a "sign of Kannadiga pride" and a "historic decision", he said it would be sent to the central government for approval.
Pointing out that the state cannot declare its flag by itself and it requires approval from the Centre,Siddaramaiah said, "So we will immediately send it to the centralgovernment. We will also try and impress upon the Centre to give its approval".
Asked whether the Centre will give its approval, he said "theConstitution does not say that the state should not have itsflag, so I believe they will agree.
Also in the federal system the national flag is always supreme and will be above the state flag, he added.
A nine-member committee formed by the government had submitted its report on designing a separate flag for the state and providing a legal standing for it on February 5.
The government's move to form the panel had drawn criticism from some quarters, with some comparing it to Jammu Kashmir,which enjoys a special status under Article 370 of the constitution.
The committee, headed by the principal secretary, Department of Kannada and Culture, was set up in June last year after a representation from noted Kannada writer and journalist Patil Puttappa and social worker Bheemappa Gundappa Gadada.
In their representation, the two hadrequested the government to design a separate flag for 'Kannada Naadu' and accord it legal standing.
Detailing about the flag design, Siddaramaiah saidthe tricolour flag has white colour at the middle of yellow and the red flag that "we unofficially use now."
The unofficial but widely regarded yellow and red 'Kannada flag' that is hoisted in the state on November one every year to commemorate the state formation day and used in theform of a scarf by Kannada activists, was designed in the 1960s.