The R445 road is a regional road in Ireland. The route is a non-motorway alternative route to the N7/M7 motorway between Naas and Limerick, and at 170 km it is one of the longest regional roads in Ireland (longer than most national roads). Indeed, much of the route comprises roads that were formerly part of the N7 between the cities, prior to motorway and other bypasses. Some of the R445 route also comprises local link roads to new N7/M7 route sections.

The official description of the R445 from the Roads Act 1993 (Classification of Regional Roads) Order 2012 reads:

Between its junction with N7 at Maudlings in the county of Kildare and its junction with N80 at Stradbally Road in the town of Portlaoise in the county of Laois via Dublin Road, Poplar Square, Main Street and Limerick Road in the town of Naas: Newhall, Buckleys Cross: Liffey Bridge, Main Street and Edward Street in the town of Droichead Nua; and Ballymany Cross; Dublin Street and Claregate Street in the town of Kildare; Cherryville Cross, Mayfield (including link road to M7); Mooreabbey and Dublin Street in the town of Monasterevin; and Clogheen in the county of Kildare: Kilinure, Ballybrittas, Cappakeel, New Inn Cross, Greatheath, Ballydavis; Rathbrennan and Dublin Road in the town of Portlaoise in the county of Laois

and

between its junction with N80 at Abbeyleix Road in the town of Portlaoise and its junction with N62 at Benamore in the county of North Tipperary via Grattan Street in the town of Portlaoise; Clonboyne, Cloncourse; Portlaoise Road, Main Street, Market Square, Bridge Street and Patrick Street at Mountrath; Holy Cross, Moorefield Cross, Rush Hall, Derrin Cross, Borris-in-Ossory and Ballaghmore Lower in the county of Laois: and Cooleeshill in the county of Offaly

and

between its junction with the N62 at Parkmore in the county of North Tipperary and its junction with N52 at Tullahedy via Inane in the county of North Tipperary Ouris and Busherstown in the county of Offaly: Greenhills in the county of North Tipperary: Moneygall in the county of Offaly: Toomevara, Clashnevin, Lisbunny: Dublin Road, Thomas MacDonagh Street, Pearse Street, Kickham Street, Ashe Road and Clare Street in the town of Nenagh: and Springfort Cross in the county of North Tipperary

and