[en] ABAREX is an optical-statistical model program for the calculation of energy averaged neutron induced nuclear reaction cross sections. The program uses the optical model algorithm of ABACUS and the statistical model method of NEARREX with many improvements and modifications. The input and output are designed to be convenient for the user and the program utilizes dynamic storage allocation with avoids fixed limits on the sizes of the various arrays. The program requires 250K storage in the IBM 370 system in its present configuration. Additional storage can easily be made available. For optical model parameter fitting, the program uses the subroutine LMDIF1 of the MINPACK-1 package of subroutines for the solution of nonlinear least square problems. No detailed description of the program will be attempted here. The capabilities and uses of the program will be outlined with special reference to neutron capture cross sections