  The B0 lifetime has been measured with a sample of 23 million BBbar pairs
collected by the BaBar detector at the PEP-II e+e- storage ring during 1999 and
2000. Events from the semileptonic decay B0 --> D*- l+ nu have been selected
with a partial reconstruction method in which only the charged lepton and the
slow pion from the D*- --> D0bar pi- decay are reconstructed. The result is
tau_B0 = 1.529+/-0.012 (stat) +/- 0.029 (syst) ps.
