The National Federation of Builders (NFB) is a United Kingdom trade association representing the interests of regional contractors and small and medium sized house builders (up to 250 homes per annum) in England and Wales.

With three other trade associations, it is represented on the UK government's Strategic Forum for Construction through the Construction Alliance.

It was founded in 1896. In 2024, it announced plans to merge with its Scottish counterpart, the Scottish Building Federation.

A non-profit organisation, the National Federation of Builders (NFB) is an independent federation which supplies business and training services to builders, constructors, contractors and house builders across England and Wales. Its website provides a public list of NFB-approved builders and a find a builder service.

The NFB includes the House Builders Association (HBA), NFB Heritage, the Major Contractors Group (MCG) and NFB Cymru.

The organisation has three main departments looking after member concerns; training, policy and membership services. Membership is split into eight regions; Southern, South West, Eastern, Midlands, North East, North West, London and Wales.

NFB members are eligible for offers, discounted products and services through Associate members and advice lines.

The NFB policy team is split into construction and housebuilding, allowing it to campaign on different agendas.