Liquid-liquid equilibria of ethylene glycol monobutyl ether (C(4)E(1)) + water and diethylene glycol monohexyl ether (C(6)E(2)) + water at atmospheric pressure were measured for temperature ranges of 322.8 K and 273.2 K to 382.5 K, respectively. The lower critical solution temperature (LCST) and upper critical solution temperature (UCST) of C(4)E(1) + water were determined to be 322.8 K and 402.8 K respectively. The LCST of C(6)E(2) + water is 273.2 K, while the corresponding UCST does not exist. The equilibrium compositions of o-chlorophenol partitioning in the top and bottom phases of the three binary C(4)E(1) + water, C(6)E(2) + water, and poly(oxyethylene(4)) lauryl ether (C(12)E(4)) + water mixtures were also measured.