  We derive the Symmetry Topological Field Theories (SymTFTs) for 3d
supersymmetric quantum field theories (QFTs) constructed in M-theory either via
geometric engineering or holography. These 4d SymTFTs encode the symmetry
structures of the 3d QFTs, for instance the generalized global symmetries and
their 't Hooft anomalies. Using differential cohomology, we derive the SymTFT
by reducing M-theory on a 7-manifold $Y_7$, which either is the link of a
conical Calabi-Yau four-fold or part of an $\text{AdS}_4\times Y_7$ holographic
solution. In the holographic setting we first consider the 3d $\mathcal{N}=6$
ABJ(M) theories and derive the BF-couplings, which allow the identification of
the global form of the gauge group, as well as 1-form symmetry anomalies.
Secondly, we compute the SymTFT for 3d $\mathcal{N}=2$ quiver gauge theories
whose holographic duals are based on Sasaki-Einstein 7-manifolds of type $Y_7 =
Y^{p,k}(\mathbb{C}\mathbb{P}^2)$. The SymTFT encodes 0- and 1-form symmetries,
as well as potential 't Hooft anomalies between these. Furthermore, by studying
the gapped boundary conditions of the SymTFT we constrain the allowed choices
for $U(1)$ Chern-Simons terms in the dual field theory.
