卡方检定（chi-square test, chi-squared, test）是参照卡方分配来求取机率和临界值的统计检定。有多种不同的卡方检定，运用在不同场合。例如：

A chi-squared test, also referred to as test (or chi-square test), is any statistical hypothesis test in which the sampling distribution of the test statistic is a chi-square distribution when the null hypothesis is true. Chi-squared tests are often constructed from a sum of squared errors, or through the sample variance. Test statistics that follow a chi-squared distribution arise from an assumption of independent normally distributed data, which is valid in many cases due to the central limit theorem. A chi-squared test can then be used to reject the null hypothesis that the data are independent.