Kumaraswamy joined about 8,000 people at the Field Marshal Manekshaw parade ground in the city centre on the occasion.
Under a cloudy sky, an Army helicopter showered rose petals over the podium where the Chief Minister and many VIPs were present.
After receiving salute from the guard of honour contingent, Kumaraswamy went around the rectangular ground in an open jeep and greeted the battalions of armed forces, state reserved police, National Cadet Corps and Bharat Scouts and Guides.
The Chief Minister delivered his I-Day speech in Kannada.
According to reports from across the state, patriotic fervour and gaiety marked I-Day celebrations in various districts where cabinet ministers and Deputy Commissioners unfurled the national flag.