  In this work we perform a complete one-loop calculation of the
flavor-changing top quark decays $t\to cg$ and $t\to cZ$ in the universal extra
dimensional models. We find that the branching ratios of these decays in the
minimal scenario remain unaltered from the Standard Model expectations for
currently allowed values of the inverse compactification radius. In the
non-minimal setup, the branching ratios can be enhanced from the Standard Model
due to the presence of boundary localized terms which modify the mass spectrum
and couplings in the theory in a non-trivial way. We also check the
compatibility of the parameter choices that result in enhancements in these
rare decays with other experimental observations.
