Example implementations relate to antenna polarization patterns. In some examples, a network device may comprise a processing resource and a memory resource storing machine-readable instructions to group antenna polarization patterns into polarization groups (PG)s, determine a respective packet error rate (PER) of a representative antenna polarization patter of each PG of the PGs, select a PG of the PGs with the representative antenna polarization pattern having the lowest determined PER of the PGs, and associate with a client device an antenna polarization pattern having the lowest determined PER of the selected PG.