Experiments on the facilitated transport of Ce(III) from mixed aqueous HNO3/NaNO3 solutions to water through supported liquid membranes (SLM) were performed using a stirred permeation cell. The SLMs consisted of organic solutions of octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) in 2-nitrophenyl octyl ether (2-NPOE) absorbed into microporous polypropylene membranes. The effects of the temperature and the carrier concentration on the permeation rate of Ce(III) were investigated. It was shown that the uphill transport of Ce(III) could be achieved without adding masking agents of Ce(III) in the strip solution. A mathematical model for analyzing the facilitated transport of Ce(III) was proposed. The permeation rate of Ce(III) could be simulated by using various physical and chemical parameters that were independently determined or estimated.