EN
We endow the diffeomorphism group $Diff_{Orb}(Q,𝓤)$ of a paracompact (reduced) orbifold with the structure of an infinite-dimensional Lie group modeled on the space of compactly supported sections of the tangent orbibundle. For a second countable orbifold, we prove that $Diff_{Orb}(Q,𝓤)$ is C⁰-regular, and thus regular in the sense of Milnor. Furthermore, an explicit characterization of the Lie algebra associated to $Diff_{Orb}(Q,𝓤)$ is given.