Dr. ing. A. Aas-Jakobsen AS, trading as Aas-Jakobsen, is a civil engineering consultant company specializing in structural engineering. The company is based in Oslo, Norway, and primarily works with bridges, roads, railways, offshore oil and buildings. The company has 250 employees. The company was established by in 1937. For the first decade, the company specialized in , but from the 1950s, the company shifted to bridge design. The company later started designing offshore installations and became a verifier for such structures, and later also became a consultant for railway projects and major road projects, such as the Bjørvika Tunnel through Oslo.