  We study when the twisted groupoid Banach $*$-algebra
$L^1(\mathcal{G},\sigma)$ is Hermitian. In particular, we prove that Hermitian
groupoids satisfy the weak containment property. Furthermore, we find that for
$L^1(\mathcal{G},\sigma)$ to be Hermitian it is sufficient that $L^1
(\mathcal{G}_\sigma)$ is Hermitian. Moreover, if $\mathcal{G}$ is ample, we
find necessary conditions for $L^1(\mathcal{G},\sigma)$ to be Hermitian in
terms of the fibers $\mathcal{G}^x_x$.
