3D Realms is a publisher of video games located in Denmark. Initially founded in Texas, the United States, under the name of Apogee Software Productions, the company changed its name to 3D Realms in 1996. It was acquired by a Danish company, SDN Invest, in 2014 and relocated to Aalborg, Denmark. 3D Realms was then acquired by Embracer Group in 2021. The company is best known for publishing Duke Nukem.