人類胚胎發育[1]是指人類胚胎的形成和發育。當精子成功進入卵細胞並與卵細胞融合時，就會出現受精。然後便會形成受精卵，此後便意味著胚胎開始發育。當人類的人類胚胎發育至第九周時，此時的胚胎開始被稱為胎兒。胚胎發育的前八周共要經歷23個階段。人類的妊娠期一共要9個月或者40周。
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