  We determine the singularity category of an arbitrary finite dimensional
gentle algebra $\Lambda$. It is a finite product of $n$-cluster categories of
type $\mathbb{A}_{1}$. Equivalently, it may be described as the stable module
category of a selfinjective gentle algebra. If $\Lambda$ is a Jacobian algebra
arising from a triangulation $\ct$ of an unpunctured marked Riemann surface,
then the number of factors equals the number of inner triangles of $\ct$.
