Sir Robert McAlpine Limited is a family-owned building and civil engineering company based in Hemel Hempstead, England. It carries out engineering and construction in the infrastructure, heritage, commercial, arena and stadium, healthcare, education and nuclear sectors.

Alfred McAlpine plc was a British construction firm headquartered in Hooton, Cheshire. It was a major road builder, and constructed over 10% of Britain's motorways, including the M6 Toll. It was listed on the London Stock Exchange until it was acquired by Carillion in 2008.