For each non-commutative ring R, the commuting graph of R is a graph with vertex set R\Z(R)\documentclass[12pt]{minimal}
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\begin{document}$$R\backslash Z(R)$$\end{document}, and two vertices x\documentclass[12pt]{minimal}
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\begin{document}$$x$$\end{document} and y\documentclass[12pt]{minimal}
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\begin{document}$$y$$\end{document} are adjacent if and only if x≠y\documentclass[12pt]{minimal}
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\begin{document}$$x \ne y$$\end{document} and xy=yx\documentclass[12pt]{minimal}
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\begin{document}$$xy = yx$$\end{document}. In this paper, we consider the domination and signed domination numbers on commuting graph Γ(R)\documentclass[12pt]{minimal}
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\begin{document}$$\varGamma (R)$$\end{document} for non-commutative ring R\documentclass[12pt]{minimal}
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\begin{document}$$R$$\end{document} with Z(R)={0}\documentclass[12pt]{minimal}
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\begin{document}$$Z(R) = \{ 0\}$$\end{document}. For a finite ring R\documentclass[12pt]{minimal}
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\begin{document}$$R$$\end{document}, it is shown that γ(Γ(R))+γ(Γ¯(R))=|R|\documentclass[12pt]{minimal}
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\begin{document}$$\gamma (\varGamma (R)) + \gamma (\bar{\varGamma }(R)) = |R|$$\end{document} if and only if R\documentclass[12pt]{minimal}
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\begin{document}$$R$$\end{document} is the non-commutative ring on four elements. Also, we determine the domination number of Γ(∏i=1tRi)\documentclass[12pt]{minimal}
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\begin{document}$$\varGamma (\prod\nolimits_{i = 1}^{t} R_{i} )$$\end{document} and commuting graph of non-commutative ring R\documentclass[12pt]{minimal}
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\begin{document}$$R$$\end{document} of order p3\documentclass[12pt]{minimal}
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\begin{document}$$p^{3}$$\end{document}, where p\documentclass[12pt]{minimal}
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\begin{document}$$p$$\end{document} is prime. Moreover, an upper bound for the signed domination number of Γ(∏i=1tRi)\documentclass[12pt]{minimal}
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\begin{document}$$\varGamma (\prod\nolimits_{i = 1}^{t} R_{i} )$$\end{document} is presented.
