The Highways Act 1980 (c. 66) is an act of the Parliament of the United Kingdom dealing with the management and operation of the road network in England and Wales. It consolidated with amendments several earlier pieces of legislation. Many amendments relate only to changes of highway authority, to include new unitary councils and national parks. By virtue of the Local Government (Wales) Act 1994 and the Environment Act 1995, most references to local authority are taken to also include Welsh councils and national park authorities.

By virtue of the National Assembly for Wales (Transfer of Functions) Order 1999 most references to 'the Minister' are taken to include the Senedd. The act is split into 14 parts covering 345 sections, it also includes 25 schedules.

Part 1 includes sections 1 to 9 of the act. The legislation contained in these sections covers:

Part 2 includes sections 10 to 23 of the act. The legislation contained in these sections covers:

Part 3 includes sections 24 to 35 of the act. The legislation contained in these sections covers:

Private landowners sometimes display a notice quoting Section 31, when there is no dedication of a public right of way.

Part 4 includes sections 36 to 61 of the act. The legislation contained in these sections covers:

Under Section 38 of the act, the highway authority may agree to adopt private roads. The authority can agree to adopt the street as a highway maintainable at public expense when all the street works have been carried out to their satisfaction, within a stated time. It is customary for the developer to enter into a bond for their performance with a bank or building society.