[en] The computer program COMFIT calculates the parameters which determine the curve of special type, fitting best to a set of data points. The calculations can be performed at present with the following functions: a linear function; a polynomial function of fixed or free degree; a sum of exponential functions. The program can deal with the situation of random measurement uncertainties in the data points in one direction (X or Y direction) or in both directions. The parameters and their standard deviations are calculated with the least squares method. Values of the goodness-of-fit are also calculated; the program is able to compare the fits obtained for different expressions. The computer program has been written in FORTRAN-4 for a CDC-CYBER-175 computer