Polimeks İnşaat ve Sanayi A.Ş. is a Turkish holding company based in Istanbul. Polimeks, established in 1995 and grew to become one of the world's leading construction companies, in recent years transformed into a global investment holding with activities in tourism, real estate, and renewable energy sectors. Polimeks primarily operates in Turkey, Russia, United Kingdom, Turkmenistan and the Netherlands.

In January 2013, the company received a contract to build the Ashgabat International Airport. Costing $2.1 billion in labor and operations, this is the largest construction project a Turkish firm has done abroad. This was preceded by the Ashgabat Wedding Palace in 2011.

In 2007 in Moscow, the company built the first Ritz-Carlton hotel in Russia, on the site of the demolished high-rise hotel Intourist, on Tverskaya Street. In Turkey, the company built a hotel in Eskişehir and a paper mill in Kazakhstan.^{[citation needed]}

According to the American magazine Engineering News-Record, Polimeks occupied 62nd place in the 2015 ranking of "225 Largest International Contractors".