Orissa Day (Oriya: ଓଡ଼ିଶା ଦିବସ) (Utkala Dibasa or Odisha Day) is celebrated on 1 April in Orissa in the memory of the formation of the state as a separate province on 1 April 1936. After losing its complete political identity in 1568 following the defeat and demise of the last Hindu king Mukunda Dev, efforts resulted into the formation of a politically separate state under British rule on linguistic basis on 1 April 1936.

The main revolution for the separate state was continued for three decades from the very day of formation of Utkal Sammilani that lead the foundation of a separate Orissa Province. The movement was more intensed with the leadership of Utkala Gouraba Madhusudan Das, Utkala mani Gopabandhu Das, 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 Orissa consisted of six districts namely Cutack, Puri, Baleswar, Sambalpur, Koraput and Ganjam having its capital at Cuttack. John Austin Hubback took oath of office and became the first Governor of Orissa Province.

Orissa /ɔːˈrɪsə/ (Oriya: ଓଡ଼ିଶା [oˑɽisaˑ], Hindi: ओड़िशा – Oṛiśā), officially spelled Odisha, is a state of India, located on the east coast of India, by the Bay of Bengal. It is the modern name of the ancient nation of Kalinga, which was invaded by the Maurya Emperor Ashoka in 261 BCE. The modern state of Orissa was established on April 1, 1936, as a province in India, and consists predominantly of Oriya speakers. April 1^st is therefore celebrated as Utkala Dibasa (formation day of Orissa). Cuttack remained the capital of the state for over eight centuries until April 13, 1948 when Bhubaneswar was officially declared as the new capital of Orissa, and is the present capital of this state.

Orissa is the ninth largest state by area in India, and the eleventh largest by population. Oriya (officially spelled Odia) is the official and most widely spoken language, spoken by three quarters of the population. Orissa has a relatively unindented coastline (about 480 km long) and lacked good ports, except for the deepwater facility at Paradip, until the recent launch of the Dhamara Port (The Dhamra Port Company Limited (DPCL) is a 50:50 joint venture of L&T and Tata Steel. DPCL has been awarded a concession by Government of Orissa to build and operate a port north of the mouth of river Dhamra in Bhadrak district). The narrow, level coastal strip, including the Mahanadi River delta supports the bulk of the population. The interior of the state is mountainous and sparsely populated.Deomali at 1672 m is the highest point of the state. Orissa is subject to intense cyclones. The most intense one, in October 1999, Tropical Cyclone 05B caused severe damage and nearly 15,000 deaths.