The top quark is interesting both as a fundamental parameter of
the standard model as well as an important input to precision electroweak
tests.  The CDF Collaboration has measured the top quark mass with high
precision in all decay channels with complementary methods.  A combination
of the results from CDF gives a top quark mass of 170.5 +/- 1.3(stat.) +/-
1.8(syst.) GeV/c2.