The binary diffusion coefficients of arachidonic acid ethyl esthers (AA-EE), cis-5,8,11,14,17-eicosapentaenoic acid ethyl esters (EPA-EE), and cis-4,7,10,13,16,19-docosahexaenoic acid ethyl esthers (DHA-EE) in supercritical carbon dioxide were measured at temperatures from 308.15 K to 338.15 K and pressures from 8.42 MPa to 29.95 MPa by the Taylor-Aris capillary peak broadening method. The obtained diffusion coefficients are in the range of (5.54 x 10(-5)) cm(2).s(-1) to (13.8 x 10(-5)) cm(2).s(-1) with small differences between AA-EE, EPA-EE, and DHA-EE. The measured D-12 values were fitted with absolute average deviations of less than 2 % by three predictive models: Scheibel, Catchpole-King, and He-Yu-Su.