Orogen (az yunoni oros — kuh va …gen), marhilai duyumi inkishofi geosinklinalhost (zonahoi az jihati tektoniki serharakati qishri Zamin). Dar in marhila qishri Zamin bolo bardoshta shuda, kuhho ba vujud meoyand.
Istilohi Orogenro soli 1921 geologi avstriyagi L. Kober ba ilm dokhil kardaast. Muvofiqi aqidai u Orogen dar bayni massahoi sakht (kratogeyaho) paydo shuda, az tasiri fishorovarii onho shakli simmetri megirad. Tuli Orogen az 100 to 1000 kilometr va barash to 100 kilometr meshavad.