Structural distortions in hybrid organic–inorganic layered halide perovskites with the Ruddlesden–Popper structure are classified into 47 different patterns of octahedral tilting via symmetry mode analysis. A survey of known compounds shows that tilt systems with both out-of-phase ϕ-tilts about theaand/orbaxes and θ-tilts (rotations) about thecaxis are favored over other patterns of octahedral tilting because this combination leads to favorable hydrogen bonding interactions between the organic cations and the inorganic layers.