赫氏圓石藻（學名：Emiliania huxleyi），經常被縮寫為「EHUX」，是一種遍佈全球水域的鈣板金藻。它被用來研究夏季的溫躍層後營養耗盡的水中形成的大範圍水華。就像其他的鈣板金藻一樣，'赫氏圓石藻是一種包覆着獨特碳酸鈣盤狀外殼的單細胞海洋浮游植物。雖然完整的鈣板金藻個體很少見，但它們大量存在於海底沉積物中。至於「赫氏圓石藻」，不只是外殼，也是可能是被記錄在沉積物里的柔軟有機體。它能合成出一組具有很強的防腐能力的化學物質，這些化學物質，比如顆石藻標誌物，可以在海底沉積物中那些早已腐爛的有機體中找到。顆石藻標誌物成為地球科學中用來研究海洋表面溫度的線索。
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在被托馬斯·亨利·赫胥黎和Cesare Emiliani命名後，赫氏圓石藻成為分佈最廣泛的鈣板金藻，這種藻為無色透明，但它們的方解石外殼能在水柱中非常有效地折射光。從衛星照片可以看出該水華可以覆蓋大面積海域(可能大於100,000平方公里)。據測定，赫氏圓石藻是迄今為止在這些條件下的優勢浮游植物。
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