Nepean—Carleton was a federal electoral district in Ontario, Canada that was represented in the House of Commons from 1979 to 1988, and again from 1997 to 2015.

It included the southern portion of the former city of Nepean and adjacent suburban and rural areas of west and southern Ottawa.

In 1996, it was re-created from parts of Nepean, Carleton—Gloucester, Lanark—Carleton and Ottawa South ridings.

It consisted initially of the townships of Goulbourn, Osgoode and Rideau, and the City of Nepean, excluding the northeastern part lying north and east of a line drawn from the western city limit east along the Queensway (Highway 417), southwest along Richmond Road, east along the Canadian National Railway, north along Merivale Road, and east along the northern boundary of the National Capital Commission buffer zone to the eastern city limit.

Pierre Poilievre from 2004 until it was abolished due to the 2012 federal electoral boundaries redistribution, which saw the riding redistributed mostly into the ridings of Carleton and Nepean with small parts going to Orléans and Kanata—Carleton.