  We review recent B+, B0d and b-baryon lifetime measurements performed by the
LEP, SLD and CDF collaborations. Lifetime ratios of tau(B+) / tau(B0d) = 1.070
+/- 0.027 and tau(b baryon) / tau(B0d) = 0.77 +/- 0.04 are obtained using all
existing measurements. The ratio between charged and neutral B meson lifetimes
is in good agreement with theory but the ratio between b-baryon and B meson
lifetimes remains somewhat lower than expected.
