深奥的编程语言（Esoteric programming language，有时简写为Esolang）是一类编程语言，它们的设计被用于测试计算机语言设计的极限，作为一个概念的证明，或仅仅是一个玩笑。esoteric将它们与开发人员真正用于编写软件的语言区别开来。通常情况下，Esolang的创作者通常并不打算让它成为主流编程语言，尽管如此，一些深奥的功能如视觉空间语法，启发了在艺术中的实际应用。这种语言在黑客和爱好者之间通常较流行。

设计者几乎不会在意语言的可用性——一般，他们的目标完全相反。通常会移除或取代传统语言的功能，但同时仍保持图灵完备性，甚至可计算性都是未知的。

An esoteric programming language (sometimes shortened to esolang) is a programming language designed to test the boundaries of computer programming language design, as a proof of concept, as software art, as a hacking interface to another language (particularly functional programming or procedural programming languages), or as a joke. The use of esoteric distinguishes these languages from programming languages that working developers use to write software. Usually, an esolang's creators do not intend the language to be used for mainstream programming, although some esoteric features, such as visuospatial syntax, have inspired practical applications in the arts. Such languages are often popular among hackers and hobbyists.