The present disclosure discloses a liquid crystal polyester (LCP), an LCP composition, and use thereof. The LCP includes a repeating unit of formula (1), a repeating unit of formula (2), and a repeating unit of formula (3): (1) -O-Ar 1 -CO-, (2) -CO-Ar 2 -CO-, and (3) -O-Ar 3 -O-, where Ar 1 is at least one selected from the group consisting of 2,6-naphthylene, 1,4-phenylene, and 4,4'-biphenylene; Ar 2 is selected from the group consisting of 1,4-phenylene, 1,3-phenylene, and 4,4'-biphenylene; and Ar 3 is selected from the group consisting of 2,6-naphthylene, 1,4-phenylene, 1,3-phenylene, and 4,4'-biphenylene; and the LCP has a melting enthalpy of over 1.5 J/g. The LCP and the composition including the LCP of the present disclosure have a high heat deflection temperature (HDT), and exhibit excellent heat resistance and anti-bubbling performance.