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In US military usage, a company-grade officer is a Second Lieutenant, First Lieutenant, or Captain.

In the Army, company-grade officers are typically assigned to a company as a platoon leader or executive officer (lieutenants) or as a commander (captains.) They may also be assigned as staff officers. They may preside over a summary court-martial. Higher ranks are called Field Grade Officers.

In the Navy and the Coast Guard, a company-grade officer is called a junior officer or JO.

In the Air Force, a company-grade officer may be referred to as a CGO.

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