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在計算複雜度理論內，時間階層定理（Time hierarchy theorems）是一個有關圖靈機時間限制上面一系列重要的定理。用不大正式的說法解釋，這理論告訴我們圖靈機在給予更多時間之後，保證能解決更多的問題。
舉例：必然存在問題是圖靈機可以用n2的時間解決，但是不能用n的時間解決。
- Michael Sipser. Introduction to the Theory of Computation. PWS Publishing. 1997. ISBN 0-534-94728-X. Pages 310–313 of section 9.1: Hierarchy theorems.
- Christos Papadimitriou. Computational Complexity 1st. Addison Wesley. 1993. ISBN 0-201-53082-1. Section 7.2: The Hierarchy Theorem, pp. 143–146.
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