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Let $\F_q$ be the finite field with $q$ elements, $p=\Char \F_q$. The group$\GL_2(\F_q)$ acts naturally in the set of irreducible polynomials over $\F_q$of degree at least $2$. In this paper we are interested in the characterizationand number of the irreducible polynomials that are fixed by the elements of asubgroup $H$ of $\GL_2(\F_q)$. We make a complete characterization of the fixedpolynomials in the case when $H$ has only elements of the form$\left(\begin{matrix} 1&b\\ 0&1 \end{matrix}\right)$, corresponding totranslations $x\mapsto x+b$ and, as a consequence, the case when $H$ is a$p-$subgroup of $\GL_2(\F_q)$. This paper also contains alternative solutionsfor the cases when $H$ is generated by an element of the form$\left(\begin{matrix} a&0\\ 0&1 \end{matrix}\right)$, obtained by Garefalakis(2010) and $H=\rm{PGL}$$_2(\F_q)$, obtained by Stichtenoth and Topuzoglu(2011).

The action of $\rm{GL}_2(\mathbb{F}_q)$ on irreducible polynomials over $\F_q$