字母歌（alphabet song），又称A-B-C歌，是世界上多个采用拉丁字母作书写文本的国家所通用的学习字母工作。这首歌通常都会在幼儿园或幼稚园时教授，甚或当小朋友还在家里时，他们的家长已经开始教他们唱这首歌。这首歌的旋律来自法国民谣«Ah! Vous Dirais-je, Maman»，但更广为人知的歌名《小星小星我问你》或《一闪一闪小星星》(“Twinkle Twinkle Little Star”)，与及莫扎特为这首歌创作的钢琴变奏曲(k.265)。

An alphabet song is any of various songs used to teach children an alphabet. Alphabet songs typically follow the alphabetic principle (though the phonics method offers variants). In languages such as English with morphophonemic variation (e.g. "cake" is /ˈkeɪk/, not [ˈkaːkɛ]), an alphabet song usually chooses a particular pronunciation for each letter in the alphabet and also typically for some words in the song.