控制股权（Controlling interest）或称控制权益，指对公司拥有话事权的持股比率。这些股份可以由一人或多人拥有。基于少数服从多数的前提下，理论上这比率可以是50%加1股，或更低的比率，视乎剩余的股份有多集中。拥有控制股权的股东，于董事局及股东大会上，持有决定性的票数，于公司营运拥有话事权。

部份国家或地区的公司法，要求3份之2的股东同意方可以通过议案，是以持有稍微多于3份之1股权的股东已经可以左右大局。福特汽车于1990年代，以33.4%小股东身份控制万事得汽车便是其中一个较知名的例子。

A controlling interest is an ownership interest in a corporation with enough voting stock shares to prevail in any stockholders' motion. A majority of voting shares (over 50%) is always a controlling interest. When a party holds less than the majority of the voting shares, other present circumstances can be looked at to determine whether that party is still considered to hold a controlling ownership interest.