Loglan，一种人工语言，被创造出来的主要目的，是用以验证萨丕尔-沃夫假说。1955年由詹姆士·库克·布朗设计，他希望能够创造出一个与自然语言截然不同的语言。如果萨丕尔-沃夫假说是正确的，学习这种语言的人，将能够以不同的方式来进行思考。在1960年，这种语言首次被发表在《科学美国人》上。Loglan启发了其他的逻辑语言，如Lojban、Ceqli等。

Loglan is a constructed language originally designed for linguistic research, particularly for investigating the Sapir–Whorf Hypothesis. The language was developed beginning in 1955 by Dr James Cooke Brown with the goal of making a language so different from natural languages that people learning it would think in a different way if the hypothesis were true. In 1960 Scientific American published an article introducing the language. Loglan is the first among, and the main inspiration for, the languages known as logical languages, which also includes Lojban, gua\spi and Ceqli.