Abstract In this paper, we consider all the non-metabelian groups of order
$162$ and characterize the structure of the unit group of the
corresponding group algebras. Overall, there are $55$
non-isomorphic groups having order $162$ and $11$ among them are
non-metabelian. We study the unit group of the semisimple
group algebras over any finite field whose characteristic does not divide the order of these eleven groups.
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