National Register of Historic Places listings in Fairfield County, Connecticut

This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Fairfield County, Connecticut, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below may be seen in an online map.

There are 300 properties and districts listed on the National Register in the county, including 9 National Historic Landmarks. Of these, 57 are located in the city of Bridgeport and covered separately in National Register of Historic Places listings in Bridgeport, Connecticut. Thirty-four are covered in National Register of Historic Places listings in Greenwich, Connecticut and another 36 are covered in National Register of Historic Places listings in Stamford, Connecticut. There are 175 properties and districts which are entirely outside those three cities or which span outside, and which are covered here in this list (Merritt Parkway is listed here as well as in the Greenwich and Stamford lists).

All of the National Historic Landmarks are listed here or in Greenwich, Stamford, and Bridgeport. Forty-six of these here or in Greenwich or Stamford are historic districts.

Architecture addressed in the NRHP listings is quite varied. Of special interest is an unusual concentration of modern or International Style houses in New Canaan, Connecticut, designed by the "Harvard Five" architects, including: Landis Gores House, the Richard and Geraldine Hodgson House, the Philip Johnson Glass House, and the Noyes House.