  Anomalous magnetic moment of the muon, $a_{\mu}=(g_{\mu}-2)/2$, is one of the
most precisely measured quantities in particle physics and it provides a
stringent test of the Standard Model. The planned improvements of the
experimental precision at Fermilab and at J-PARC propel further reduction of
the theoretical uncertainty of $a_{\mu}$. The hope is that the efforts on both
sides will help resolve the current discrepancy between the experimental
measurement of $a_{\mu}$ and its theoretical prediction, and potentially gain
insight into new physics. The dominant sources of the uncertainty in the
theoretical prediction of $a_{\mu}$ are the errors of the hadronic
contributions. I will discuss recent progress on determination of hadronic
contributions to $a_{\mu}$ from lattice calculations.
