含水層[1]（英語：aquifer），也作蓄水層[2]，是指地底一層含有水分的滲透岩、岩石碎隙或未固結的材料（礫石、沙、淤泥）。人們可通過打鑽水井來從含水層提取地下水。研究含水層的水流、含水層特徵的學科被稱為水文地質學。
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