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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.
| Parliament | Years | Member | Party | |
| Nepean—CarletonRiding created from Grenville—Carleton and Ottawa—Carleton | ||||
| 31st | 1979–1980 | Walter Baker | Progressive Conservative | |
| 32nd | 1980–1984 | |||
| 33rd | 1984–1988 | William Tupper | ||
| Riding dissolved into Nepean, Carleton—Gloucesterand Lanark—Carleton | ||||
| Riding re-created from Nepean, Carleton—Gloucester,Lanark—Carleton and Ottawa South | ||||
| 36th | 1997–2000 | David Pratt | Liberal | |
| 37th | 2000–2004 | |||
| 38th | 2004–2006 | Pierre Poilievre | Conservative | |
| 39th | 2006–2008 | |||
| 40th | 2008–2011 | |||
| 41st | 2011–2015 | |||
| Riding dissolved into Nepean, Carleton, Orléans, and Kanata—Carleton | ||||
| 2011 Canadian federal election | ||||||||
| Party | Candidate | Votes | % | mw- ±% | Expenditures | |||
| Conservative | Pierre Poilievre | 43,477 | 54.45 | -1.39 | – | |||
| Liberal | Ryan Keon | 20,146 | 25.23 | +1.81 | – | |||
| New Democratic | Ric Dagenais | 12,962 | 16.23 | +6.52 | – | |||
| Green | Jean-Luc Cooke | 3,260 | 4.08 | -6.94 | – | |||
| Total valid votes/Expense limit | 79,845 | 100.00 | – | |||||
| Total rejected ballots | 272 | 0.34 | -0.05 | |||||
| Turnout | 80,117 | 72.55 | +3.16 | |||||
| Eligible voters | 110,425 | – | – | |||||
| 2008 Canadian federal election | ||||||||
| Party | Candidate | Votes | % | ±% | Expenditures | |||
| Conservative | Pierre Poilievre | 39,915 | 55.84 | +1.1 | $86,150 | |||
| Liberal | Ed Mahfouz | 16,743 | 23.42 | -4.6 | $40,049 | |||
| Green | Lori Gadzala | 7,880 | 11.02 | +5.3 | $21,886 | |||
| New Democratic | Phil Brown | 6,946 | 9.71 | -1.9 | $16,371 | |||
| Total valid votes/Expense limit | 71,484 | 100.00 | $99,843 | |||||
| Total rejected ballots | 280 | 0.39 | – | |||||
| Total votes | 71,764 | 69.39 | – | |||||
| 2006 Canadian federal election | ||||||||
| Party | Candidate | Votes | % | ±% | ||||
| Conservative | Pierre Poilievre | 39,260 | 54.7 | +9.0 | ||||
| Liberal | Michael Gaffney | 20,111 | 28.0 | -12.1 | ||||
| New Democratic | Laurel Gibbons | 8,324 | 11.6 | +2.5 | ||||
| Green | Lori Gadzala | 4,090 | 5.7 | +1.4 | ||||
| Total valid votes | 71,785 | 100.0 | ||||||
| 2004 Canadian federal election | ||||||||
| Party | Candidate | Votes | % | ±% | ||||
| Conservative | Pierre Poilievre | 30,420 | 45.7 | -7.7 | ||||
| Liberal | David Pratt | 26,684 | 40.1 | -1.1 | ||||
| New Democratic | Phil Brown | 6,072 | 9.1 | +5.4 | ||||
| Green | Chris Walker | 2,886 | 4.3 | +3.0 | ||||
| Marijuana | Brad Powers | 561 | 0.8 | |||||
| Total valid votes | 66,623 | 100.0 | ||||||
| 2000 Canadian federal election | ||||||||
| Party | Candidate | Votes | % | ±% | ||||
| Liberal | David Pratt | 24,570 | 41.2 | -7.6 | ||||
| Alliance | Michael Green | 22,310 | 37.4 | +11.0 | ||||
| Progressive Conservative | Bill Knott | 9,536 | 16.0 | -3.1 | ||||
| New Democratic | Craig Parsons | 2,223 | 3.7 | -1.1 | ||||
| Green | Isobel McGregor | 805 | 1.3 | |||||
| Canadian Action | Jack Waisvisz | 131 | 0.2 | -0.3 | ||||
| Natural Law | Lester Newby | 118 | 0.2 | -0.2 | ||||
| Total valid votes | 59,693 | 100.0 | ||||||
| 1997 Canadian federal election | ||||||||
| Party | Candidate | Votes | % | |||||
| Liberal | David Pratt | 28,366 | 48.8 | |||||
| Reform | Paul Fitzgerald | 15,333 | 26.4 | |||||
| Progressive Conservative | Betty Hill | 11,072 | 19.0 | |||||
| New Democratic | Cathy Martin | 2,788 | 4.8 | |||||
| Canadian Action | Terrence Bell | 331 | 0.6 | |||||
| Natural Law | Brian Jackson | 238 | 0.4 | |||||
| Total valid votes | 58,128 | 100.0 | ||||||
| 1984 Canadian federal election | ||||||||
| Party | Candidate | Votes | % | ±% | ||||
| Progressive Conservative | Bill Tupper | 41,663 | 55.9 | +2.4 | ||||
| Liberal | Gord Hunter | 20,852 | 28.0 | -5.1 | ||||
| New Democratic | Bea Murray | 11,035 | 14.8 | +2.6 | ||||
| Green | Gregory Vezina | 737 | 1.0 | |||||
| Independent | Ray Turmel | 204 | 0.3 | |||||
| Total valid votes | 74,491 | 100.0 | ||||||
| 1980 Canadian federal election | ||||||||
| Party | Candidate | Votes | % | ±% | ||||
| Progressive Conservative | Walter Baker | 31,498 | 53.5 | -6.0 | ||||
| Liberal | Gord Hunter | 19,482 | 33.1 | +5.4 | ||||
| New Democratic | Alan White | 7,187 | 12.2 | -0.5 | ||||
| Rhinoceros | Alan Cockerell | 658 | 1.1 | |||||
| Total valid votes | 58,825 | 100.0 | ||||||
| 1979 Canadian federal election | ||||||||
| Party | Candidate | Votes | % | |||||
| Progressive Conservative | Walter Baker | 36,717 | 59.6 | |||||
| Liberal | Bluma Appel | 17,108 | 27.8 | |||||
| New Democratic | Marnie Girvan | 7,810 | 12.7 | |||||
| Total valid votes | 61,635 | 100.0 | ||||||