The A489, officially known as the Newtown to Machynlleth Trunk Road in Wales, is a trunk road in the United Kingdom running from Craven Arms, Shropshire to Machynlleth, Powys and crossing the Wales-England border.

The road starts about one mile north of Craven Arms.

From here it travels through Lydham, Churchstoke, Newtown, Caersws, Cemmaes Road and Machynlleth.

Similarly in Lydham, albeit for a much shorter distance, the road overlaps with the A488.

A new section of road, the Newtown Bypass, was completed in 2019.