Họ Sam (danh pháp khoa học: Limulidae) là họ duy nhất trong bộ đuôi kiếm (Xiphosurida) còn có loài sinh tồn hiện nay. Nó chứa khoảng 4-5 loài (tùy theo quan điểm phân loại) sam thuộc lớp Xiphosura, trước đây gọi là Merostomata. Loài được biết đến nhiều có lẽ là sam Mỹ (Limulus polyphemus). Do đã tồn tại cách ngày nay 450 triệu năm (Mya), các loài sam được xem là hóa thạch sống.
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