Twistane (IUPAC name: tricyclo[4.4.0.0^3,8]decane) is an organic compound with the formula C₁₀H₁₆. It is a cycloalkane and an isomer of the simplest diamondoid, adamantane, and like adamantane, is not very volatile. Twistane was named for the way its rings are permanently forced into the cyclohexane conformation known as the "twist-boat". The compound was first reported by Whitlock in 1962.