A liquid crystal polyester fibers containing a liquid crystal polyester, in which the liquid crystal polyester has repeating units represented by Formulae (1), (2) and (3), at least one of the repeating units contains 2,6-naphthylene, a content of the repeating unit containing the 2,6-naphthylene is 40 mol% or greater with respect to a total content of all the repeating units, and an orientation degree of the liquid crystal polyester in a length direction of the fiber is 89% to 95%: —O—Ar1—CO—  (1), —CO—Ar2—CO—  (2), and —X—Ar3—Y—  (3), wherein Ar1 represents phenylene, naphthylene, or biphenylylene, Ar2 and Ar3 each independently represent phenylene, naphthylene, or biphenylylene, and at least one of Ar1, Ar2, and Ar3 contains 2,6-naphthylene, X and Y each independently represent oxygen or —NH—, Ar1, Ar2, or Ar3 may be each independently substituted with halogen, alkyl, or aryl.