Odisha Day (Odia: ଓଡ଼ିଶା ଦିବସ, also Odisha Dibas and Utkala Dibas (Odia: ଉତ୍କଳ ଦିବସ)is celebrated on 1 April in Odisha in the memory of the formation of the state as a separate province on 1 April 1936.  After losing its political identity completely in 1568 following the defeat and demise of the last king Mukunda Dev, efforts resulted in the formation of a politically separate state under British rule on a linguistic basis on 1 April 1936.
The main revolution in this separate state continued for three decades from the very day of formation of Utkala Sammilani that led to the foundation of a separate Odisha Province. The movement turned more intense under the leadership of Utkala Gouraba Madhusudan Das, Utkala mani Gopabandhu Das, Maharaja SriRam Chandra Bhanj Deo, Maharaja Krushna Chandra Gajapati, Pandita Nilakantha Das, Fakir Mohan Senapati, Gangadhar Meher, Basudeba Sudhaladeba, Radhanath Ray, Bhubanananda Das, A. P. Patro and many others with the support of the public. The newly formed Odisha consisted of six districts namely Cuttack, Puri, Baleswar, Sambalpur, Koraput and Ganjam with its capital at Cuttack. John Austin Hubback took the oath of office and became the first Governor of Odisha Province.
Odisha Dibas / Utkala Dibas is celebrated every year on 1 April all over Odisha. Thousands of shops and Jhankis make this festival more beautiful. There are competitions arranged by popular local politicians like fireworks competition. One can enjoy these fireworks displays which make the sky all the more stunning. On that day all across the country, the family of Odia arranges different cultural programs like a sing-song program. Utkala Dibas the day of remembrance for all Odia helps everybody to be united.
- "Utkala Dibas also called Odisha Day is celebrated on April 1st today". infocera.com. 2012. Archived from the original on 5 May 2011. Retrieved 3 July 2012.
The Odisha province was formed on the basis of linguistic pattern of people in the area on April 1, 1936
- "Poor water management has made Odisha victim of drought and floods". The Hindu. Retrieved 6 April 2006.
- Orissareview. April 2008. pp. 17-19
- Formation of Orissa as a Separate Province by Pareswar Sahoo. Orissareview. April 2006
- Orissa's new name is Odisha The Times Of India
- "Districts of Odisha". Official Portal. Bhubaneswar: Government of Odisha. Retrieved 4 January 2013.
- "Districts of Orissa". Archived from the original on 16 January 2012. Retrieved 13 January 2012.
- "List of Districts" (pdf). Retrieved 13 January 2012.