Sydney Metro Northwest was a rapid transit project that constructed the first section of the Metro North West Line through the north-western suburbs of Sydney, New South Wales, Australia. The project included the conversion of the existing Epping to Chatswood rail link to metro standards and connects the suburbs of Rouse Hill and Chatswood via Castle Hill and Epping. The project was managed by Transport for NSW. The completed Metro North West Line opened on 26 May 2019.

The Metro North West Line is a rapid transit rail line in Sydney, New South Wales, Australia. The first and currently the only line on the Sydney Metro network, it commenced operation on 26 May 2019, running between Tallawong and Chatswood.