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爬蟲類(正寫爬行類)係脊索動物之中嘅爬蟲綱(又叫蜥形綱)嘅所有物種嘅通稱,係世界上最古老嘅陸上脊椎動物。原始嘅品種大約喺3億4000萬年前就開始出現,比起人嘅200萬年早好多。佢哋同魚一樣,都係冷血動物。有啲品種食肉,有啲品種食菜。大多數卵生或卵胎生,生啲有革質外皮嘅蛋,由蛋發育成幼仔唔需要經過幼體期。表皮有鱗片,可以阻止體液流失。
爬蟲類而家有至少6000種。恐龍死咗之後,就剩低4個目:鱷目、喙頭目、有鱗目同龜鱉目。除咗海龜返去海之外,其他都係陸生。
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