B^0 mixing measurements from the Tevatron Run I data are reported.
These include time-integrated measurements of the average mixing parameter
chi-bar, six time-dependent oscillation measurements of Delta m_d, and a
time-dependent limit on Delta m_s.  Such measurements provide constraints on
CKM matrix elements.  A sample of B^0/B-bar^0 -> J/psi K^0_s decays is used to
directly measure the CP-violation parameter sin(2 Beta).  This value agrees
well with indirect constraints from the CKM matrix.