  Recent measurements of the mass of the top quark are presented using 162 pb-1
of data of ppbar collisions at sqrt(s)=1.96 TeV collected by the CDF detector
at the Tevatron collider during Run II. The analyses focus on the semi-leptonic
decay mode with one or two identified bottom quarks. The Template Method
reconstructs the invariant mass of the top quark in each event. The
Multivariate Template Method enhances this approach by adding information on
the event topology. The Dynamical Likelihood Method discriminates between
possible mass values using top quark decay observables and attempts to use the
maximum amount of information on top quarks provided by the Standard Model. All
three methods produce similar results. The Dynamical Likelihood Method yields a
top quark mass of 177.8+-4.5/5.0(stat)+-6.2(sys)GeV/c^2.
