Presented are the most recent jet fragmentation results from CDF:
inclusive distributions of charged particle momenta and their k_T in jets;
average track multiplicities, as well as angular distributions of multiplicity
flow, for a wide range of jet energies with E_T from 40 to 300 GeV.  The
results are compared with Monte-Carlo and, when possible, analytical
calculations performed in resummed perturbative QCD approximations (MLLA).