Abstract: 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—Ar1—CO—, (2) —CO—Ar2—CO—, and (3) —O—Ar3—O—, where Ar1 is at least one selected from the group consisting of 2,6-naphthylene, 1,4-phenylene, and 4,4?-biphenylene; Ar2 is selected from the group consisting of 1,4-phenylene, 1,3-phenylene, and 4,4?-biphenylene; and Ar3 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.