Chackbay is a census-designated place (CDP) in northern Lafourche Parish, Louisiana, United States.

[2] Chackbay is located along the northern edge of Lafourche Parish at 29°53′9″N 90°47′27″W / 29.88583°N 90.79083°W / 29.88583; -90.79083.

Louisiana Highway 20 runs through the western part of the CDP, leading south 7 miles (11 km) to Thibodaux, the parish seat, and northeast 13 miles (21 km) to Vacherie.

According to the United States Census Bureau, the Chackbay CDP has a total area of 28.5 square miles (73.9 km2), all of it recorded as land.

[4] As of the 2020 United States census, there were 5,370 people, 2,003 households, and 1,564 families residing in the CDP.