Obrascón Huarte Lain, S.A., or OHL, is a Spanish-based multinational construction and civil engineering company. The company is involved in infrastructure and commercial property construction, as well as home building and the operation of toll roads and other transport concessions. In the latter, the group is particularly active in Brazil through its majority-owned subsidiary OHL Brasil and in Mexico with OHL México. OHL also has a majority-owned American subsidiary called Tower-OHL Group which is based in Miami, Florida.

OHL was founded by the US$900 million merger in 1999 of the firms Obrascón-Huarte and Construcciones Lain.Since July 2008 the company has been a constituent of the benchmark IBEX 35 stock market index on the Bolsa de Madrid.