Nassau Bay is a city in Harris County, Texas, United States, bordering the outermost southeastern edge of the city of Houston. It is located in the Clear Lake Area near Galveston Bay, directly adjacent to the Lyndon B. Johnson Space Center. The population was 5,347 at the 2020 census.

Clear Lake, or the Clear Lake Area, is a region in parts of Harris and Galveston County in Texas, United States. It is part of the Galveston Bay Area, which itself is a section of the Houston–The Woodlands–Sugar Land metropolitan area. The area is geographically characterized by the bodies of water in it and around it, including Clear Lake, Taylor Lake, Clear Creek, and Galveston Bay.