Fairfield Township may refer to:

Illinois

• Fairfield Township, Bureau County, Illinois

Indiana

• Fairfield Township, DeKalb County, Indiana
• Fairfield Township, Franklin County, Indiana
• Fairfield Township, Tippecanoe County, Indiana

Iowa

• Fairfield Township, Buena Vista County, Iowa
• Fairfield Township, Cedar County, Iowa
• Fairfield Township, Fayette County, Iowa
• Fairfield Township, Grundy County, Iowa
• Fairfield Township, Jackson County, Iowa
• Fairfield Township, Palo Alto County, Iowa

Kansas

• Fairfield Township, Russell County, Kansas

Michigan

• Fairfield Township, Lenawee County, Michigan
• Fairfield Township, Shiawassee County, Michigan

Minnesota

• Fairfield Township, Crow Wing County, Minnesota
• Fairfield Township, Swift County, Minnesota

Missouri

• Fairfield Township, Carroll County, Missouri

Nebraska

• Fairfield Township, Clay County, Nebraska
• Fairfield Township, Harlan County, Nebraska

New Jersey

• Fairfield Township, Cumberland County, New Jersey
• Fairfield Township, Essex County, New Jersey

North Carolina

• Fairfield Township, Hyde County, North Carolina, in Hyde County, North Carolina

North Dakota

• Fairfield Township, Grand Forks County, North Dakota, in Grand Forks County, North Dakota

Ohio

• Fairfield Township, Butler County, Ohio
• Fairfield Township, Columbiana County, Ohio
• Fairfield Township, Highland County, Ohio
• Fairfield Township, Huron County, Ohio
• Fairfield Township, Madison County, Ohio
• Fairfield Township, Tuscarawas County, Ohio
• Fairfield Township, Washington County, Ohio

Pennsylvania

• Fairfield Township, Crawford County, Pennsylvania
• Fairfield Township, Lycoming County, Pennsylvania
• Fairfield Township, Westmoreland County, Pennsylvania

South Dakota

• Fairfield Township, Beadle County, South Dakota, in Beadle County, South Dakota