The wear properties of extruded Mg–Zn–Y alloys containing a long-period stacking ordered (LPSO) phase were investigated during lubricated pin-on-disc (POD) type tests. The Mg96Zn2Y2 alloy with uneven LPSO-phase layers and α-Mg grains, including fine plate-like LPSO phase, exhibited smaller wear mass loss compared to that of the Mg97Zn1Y2 alloy without the fine plate-like LPSO phase. Transmission electron microscopy at the worn subsurface layer revealed that the dynamic crystallisation of the α-Mg grains increased the wear mass loss. The presence of a fine plate-like LPSO phase inside the α-Mg delayed the dynamic crystallisation of α-Mg grains under the lower normal load while it reduced the thickness of the dynamically crystallised layer after sliding deformation under the higher normal load in the Mg96Zn2Y2 alloy.