Enthalpies of dilution at 298.15 K of aqueous solutions of the dipeptides glycyl-L-valine, glycyl-D-leucine, glycyl-L-asparagine, glycyl-L-threonine, glycyl-DL-threonine and glycyl-DL-serine have been determined using flow microcalorimetry. The results obtained were used to determine the enthalpic interaction coefficients that characterise pair interactions of the peptides in aqueous solution. These coefficients were compared with those for other dipeptides and also with those for some amino acids.