Cut Off (historically named La Coupe) is a census-designated place (CDP) on the Bayou Lafourche in Lafourche Parish, Louisiana, United States. The population was 5,976 at the 2010 census. It is part of the Houma–Bayou Cane–Thibodaux Metropolitan Statistical Area. Cut Off's ZIP code is 70345, the area code is 985 and local telephone prefixes are 325, 632 and 693.
Cut Off had its start by the building of a canal cutoff at that point from Bayou Lafourche northeast to Lake Salvador, to shorten the route to New Orleans. The name (La Coupe, or "The Cut") was French in origin.
Cut Off is located in south-central Lafourche Parish at 29°30′55″N 90°20′2″W (29.515201, -90.333839), on both sides of Bayou Lafourche. It is bordered to the northwest by Larose and to the south by Galliano.
Louisiana Highway 1 runs through the center of Cut Off, along the west bank of Bayou Lafourche, while Highway 308 runs along the east bank. Highway 3235, a four-lane highway, runs through the west side of the community. All three highways lead northwest into Larose and south into Galliano.