  We calculate the contribution of second generation scalar leptoquarks to the
anomalous magnetic moment of the muon (AMMM). In the near future, E-821 at
Brookhaven will reduce the experimental error on this parameter to $\Delta
a_\mu^{\rm exp}<4\times 10^{-10}$, an improvement of 20 over its current value.
With this new experimental limit we obtain a lower mass limit of
$m_{\Phi_L}>186$\ GeV for the second generation scalar leptoquark, when its
Yukawa-like coupling $\lambda_{\Phi_L}$\ to quarks and leptons is taken to be
of the order of the electroweak coupling $g_2$.
