選擇公理(英文:Axiom of Choice,簡稱AC)係數學入面一條集合論公理。佢有幾種表達方式,其中一種係,畀一個由索引族I標籤嘅集合族(Si)i∈I)_},當中每一個集都唔係空嘅,咁就存在一個方法,係每個集入面揀一個元素出嚟,形成(xi)i∈I)_}。另一個表達方法係,存在函數f:I→⋃Si},符合f(i)∈Si},呢個函數f叫做選擇函數。
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