Decimus Oil Corp. is a junior oil and gas exploration and production company headquartered in Calgary, Alberta, Canada. The company specializes in the acquisition, development, and production of oil and gas assets primarily within the Western Canadian Sedimentary Basin. Decimus Oil focuses on Mannville formation development in Southern Alberta, leveraging a strategy that combines low-risk acquisitions with modern completion techniques to maximize resource extraction. Its operations include conventional oil and gas as well as energy infrastructure and waste management facilities, enabling handling of third-party produced water and other materials at its wholly owned sites. The company underwent a name change from Tenth Avenue Petroleum Corp. to Decimus Oil Corp. in October 2025 to better reflect its strategic focus. Founded in 2011, Decimus maintains a land base exceeding 26,000 gross acres, emphasizing optimization and growth in its regional resource plays.