專門用途英語(ESP)是英語作為第二語言或外語的一個子集。它通常指的是向大學生或已經就業的人教授英語，涉及他們需要的特定詞匯和技能。與任何語言教為特定目的,給定的ESP課程將集中在一個職業或行業,如技術英語,科技英語,醫學英語專業人士,服務員英語,旅游英語,等。[1]盡管看似有限的關注,ESP課程可以產生廣泛影響,與環境一樣英語。[2]在學生獲得學位之前或學位期間教授的學術英語，與商務英語一樣，是一種專門用途英語。向飛行員、空中交通管制員和民航學員教授航空英語，使無線電通訊暢通無阻。

English for specific purposes (ESP) is a subset of English as a second or foreign language. It usually refers to teaching the English language to university students or people already in employment, with reference to the particular vocabulary and skills they need. As with any language taught for specific purposes, a given course of ESP will focus on one occupation or profession, such as Technical English, Scientific English, English for medical professionals, English for waiters, English for tourism, etc.[1] Despite the seemingly limited focus, a course of ESP can have a wide-ranging impact, as is the case with Environmental English.[2]English for academic purposes, taught to students before or during their degrees, is one sort of ESP, as is Business English. Aviation English is taught to pilots, air traffic controllers and civil aviation cadets to enable clear radio communications.