Ottawa West—Nepean (French: Ottawa-Ouest–Nepean) is a provincial electoral district in eastern Ontario, Canada.

The riding is represented in the Ontario legislature by the NDP's Chandra Pasma.

In the 2003 provincial election, former Ottawa mayor Jim Watson ousted Guzzo.

Chiarelli lost his seat to PC Jeremy Roberts in 2018 which saw the former governing Liberals fall to third place in the legislature.

This marked the first time the NDP had ever won the seat, either provincially or federally.