Monaro Highway is a 285-kilometre-long (177 mi) highway in Victoria, New South Wales, and the Australian Capital Territory, in Australia, linking Cann River in Victoria to Canberra in the Australian Capital Territory (ACT) via the Monaro region. From its southern terminus, it follows the nearby Cann River upstream towards the New South Wales border through heavily forested terrain. Within New South Wales (NSW), it makes its way through further forest before reaching the pastures typical of the Monaro. There are multiple towns and villages along the highway, including Bombala, Nimmitabel, and Cooma. The terrain within the Monaro is largely hilly, and there are numerous crossings. The road also parallels the former Bombala railway line in several locations. Within the ACT, the road becomes a high volume roadway and serves the southern suburbs of Canberra. The highway has more recently had a grade-separated dual carriageway extension constructed within Canberra, as part of the Eastern Parkway construction project. It is designated part of route M23, and route A23 within Canberra, and route B23 within Victoria and New South Wales, with a concurrency where it also carries route B72 between the two sections of Snowy Mountains Highway.

Monaro, once frequently spelt "Manaro", or in early years of settlement "Maneroo" is a region in the south of New South Wales, Australia. A small area of Victoria near Snowy River National Park is geographically part of the Monaro. While the Australian Capital Territory is not considered part of the region, some towns in the Monaro have close links with Canberra.