无屈折拉丁语(Latino sine Flexione)是一个人造语言，于1903年由意大利数学家朱塞佩·皮亚诺所发明，是一种简化的拉丁语。

• 仿拉丁语(Dog Latin) - 拉丁语没有动词变化，或者词形变化
• 打油诗

Latino sine flexione ("Latin without inflections"), or Peano’s Interlingua (abbreviated as IL), is an international auxiliary language invented by the Italian mathematician Giuseppe Peano (1858–1932) in 1903. It is a simplified version of Latin, and retains its vocabulary. It was published in the journal Revue de Mathématiques (meaning Mathematical Review), in an article entitled De Latino Sine Flexione, Lingua Auxiliare Internationale (meaning Latin Without Inflection, International Auxiliary Language), which explained the reason for its creation. The article argued that other auxiliary languages were unnecessary, since Latin was already established as the world’s international language. The article was written in classical Latin, but it gradually dropped its inflections until there were none.