七旬斋（英语：Septuagesima）是西方基督教会大斋节前的第三个星期日，复活节前的第70天（拉丁文septuagesimus意为“第七十”）。七旬斋之名显然是由“四旬斋”（Quadragesima）和“五旬斋”（Quinquagesima）类推而得。
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