The state government made elaborate preparations to observe the Karnataka Rajyotsava or Karnataka Formation Day (literally 'Birth of the Kannada State').
Schools and offices remained closed to mark the day.
Here's the history behind all these celebrations:
Mysore state was formed on November 1, 1956, merging the Kannada-speaking regions of Bombay and Madras presidencies and the principality of Hyderabad, with the princely Mysore state, based on the recommendations of the States Reorganisation Commission. November 1 each year has since been observed as Karnataka Rajyotsava Day.
In 1973, after prolonged debate, the then chief minister Devraj Urs took a decision to change the name of the state to Karnataka.
And this is how the users of the micro-blogging site, Twitter, celebrated the day: