天南星目是单子叶植物的一个目，这个目现在已经合并到泽泻目内。

天南星目只有二科：

• 天南星科 Araceae
• 浮萍科 Lemnaceae

浮萍科现在已经合并到天南星科内。

旧分类系统克朗奎斯特分类法曾经将菖蒲科归类为天南星目下的一科，而新分类系统APG II 分类法将菖蒲科分类为菖蒲目的一科。

天南星目是泽泻目的姊妹群，现在已经全部并入泽泻目禸。天南星目原来的二科，天南星科与浮萍科合并为一科（天南星科），新的天南星科则分类为泽泻目下的一科。

Arales is a botanical name for an order of flowering plants. The name was used in the Cronquist system for an order placed in subclass Arecidae, circumscribed as (1981):

The APG II system elevates the first of these three families to become an order Acorales of its own (consisting of one genus only!) and unites the last two of these families into the family Araceae and assigns this to the order Alismatales.