📌 The Canadian federal electoral district of Ottawa West—Nepean was contested in the 2004 election.

🏆 Marlene Catterall, the Liberal candidate, won the riding with 23,647 votes (41.8% of the vote).

🥈 The runner-up was Sean Casey (Conservative) with 22,193 votes (39.3%), defeated by a margin of 1,454 votes.

📊 Other notable candidates: Marlene Rivier (N.D.P., 13%).