Title: Dihedral-product groups of nonabelian simple groups

Abstract: Given a finite group $G$, a group $X$ is called a dihedral-product group of $G$ if $X=GD$ where $D$ is a finite dihedral group. In particular, it is called a dihedral-skew product group of $G$ if $G\cap D=1$ and $D$ has a trivial core in $X$. In this paper, dihedral-skew product groups of all nonabelian simple groups are classified and dihedral-product groups of all nonabelian simple groups are characterized.