The Unitary Executive Theory is a theory of American constitutional law holding that the President possesses the power to control the entire executive branch. The doctrine is rooted in Article Two of the United States Constitution, which vests "the executive power" of the United States in the President.

Although that general principle is widely accepted, there is disagreement about the strength and scope of the doctrine.^[1] It can be said that some favor a "strongly unitary" executive, while others favor a "weakly unitary" executive.^[1] The former group argue, for example, that Congress's power to interfere with intra-executive decision-making (such as firing executive branch officials) is limited, and that the President can control policy-making by all executive agencies within the limits set for those agencies by Congress. Still others agree that the Constitution requires a unitary executive, but believe this is a bad thing, and propose its abolition by constitutional amendment.^[2]

In several states, in contrast to the federal government, executive officers such as lieutenant governor, attorney general, comptroller, secretary of stateand others are elected independently of the state's governor, with Texas being one example. This type of Executive structure is known as a Plural Executive.