[en] Crystal-field splittings of Ho³⁺ ions in HoCl₃.6H₂O are re-analyzed in order to obtain a consistent and standardized crystal-field parameter (CFP) set. Experimental energy levels were fitted to Hamiltonian parameters representing the combined free-ion and crystal-field interactions for a 4f¹⁰ ion in the actual C₂ symmetry site. A relatively low r.m.s. deviation of 8.8 cm^-1 is achieved. The reliable starting values of the CFPs were obtained from superposition model analysis. The crystal-field strength, S, is significantly larger for HoCl₃.6H₂O (S = 262 cm^-1) than for Ho³⁺:LaCl₃ (S = 133 cm^-1) or Ho(C₂H₅SO₄)₃.9H₂O (S = 183 cm^-1), in which Ho³⁺ ion is coordinated by nine chlorine atoms or nine oxygen atoms from water molecules, respectively