香豆素重排反應（香豆素－苯並呋喃縮環反應，英文英語：coumarin–benzofuran ring contraction或Perkin rearrangement）是有機重排反應，氫氧化物攻入2-鹵香豆素，縮環形成苯並呋喃。反應於1870年由白威廉首次公佈，因而得名。提出的反應機理有幾種，全都認為內酯首先開環生成羧酸鹽和酚鹽。[1]
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