Christmas Bay is a small bay located on the Texas Gulf Coast in Brazoria County, Texas, immediately southwest of West Bay. It is a minor estuary, one of a series of estuaries along the Gulf Coast of Texas, and receives the discharge from Bastrop Bayou, along with the adjacent coastal watershed. The bay is separated from the Gulf of Mexico by Follet's Island and connects with it through San Luis Pass and . Its minor extensions are to the north and to the southwest. The nearest city is Freeport, about 10 miles (16 km) to the southwest at the mouth of the Brazos River.