在计算机科学中，语法错误是指程序的语法有误，编译器或解译器在词法分析时无法将其转换为适当的编程语言。

在编译语言中，语法错误一定只在编译期时出现，编译器要所有的语法都正确，才能正确编译。不过直译语言中的语法错误可能要到运行期才会出现，而且不一定容易区分语法错误及语意错误。

早期8比特家用电脑的用户接口是BASIC解释器，SYNTAX ERROR错误消息常造成用户的困扰，只要解释器无法识别用户的输入，就会出现此一消息。

若计算器中输出不正确的算式，也会出现语法错误，例如算式中有左括号但没有右括号、或是一个数字中有多个小数点等。

In computer science, a syntax error is an error in the syntax of a sequence of characters or tokens that is intended to be written in a particular programming language.

For compiled languages, syntax errors are detected at compile-time. A program will not compile until all syntax errors are corrected. For interpreted languages, however, a syntax error may be detected during program execution, and an interpreter's error messages might not differentiate syntax errors from errors of other kinds.