Roger Niello (born 2 June 1948) is an American politician who is currently in the California State Senate representing the 6th district, which includes portions of Sacramento and Placer counties.

After graduating from Sacramento's Encina High School, Niello attended the University of California at Berkeley for his undergraduate studies, then completed his graduate studies at the University of California at Los Angeles.

In 1995, Niello served as the President of the Sacramento Metropolitan Chamber of Commerce, and was a member of the Capital Area Political Action Committee.

Niello was elected to the State Senate in 2022, representing the 5th district in the California State Assembly, which includes the Sacramento County communities of Arden Arcade, Carmichael, the City of Citrus Heights, Fair Oaks, the City of Folsom, North Highlands, McClellan Park, Orangevale, Natomas, Sacramento and the Placer County community of Granite Bay.

Niello has worked on legislation to allow individuals to remove racially charged language from a homeowner's CC&Rs, a measure to assist local governments in cracking down on illegal dumping, and a bill to ban county retired annuitants from collecting unemployment and retirement pension benefits.