For completely contractive Banach algebras A and B (respectively operator algebras A and B), the necessary and sufficient conditions for the operator space projective tensor product A⊗^B\documentclass[12pt]{minimal}
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\begin{document}$${A\widehat{\otimes}B}$$\end{document} (respectively the Haagerup tensor product A⊗hB\documentclass[12pt]{minimal}
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\begin{document}$${A\otimes^{h}B}$$\end{document}) to be Arens regular are obtained. Using the non-commutative Grothendieck inequality, we show that, for C*-algebras A and B, A⊗γB\documentclass[12pt]{minimal}
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\begin{document}$${A\otimes^{\gamma} B}$$\end{document} is Arens regular if A⊗^B\documentclass[12pt]{minimal}
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\begin{document}$${A\widehat{\otimes}B}$$\end{document} and A⊗^Bop\documentclass[12pt]{minimal}
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\begin{document}$${A\widehat{\otimes}B^{op}}$$\end{document} are Arens regular whereas A⊗^B\documentclass[12pt]{minimal}
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\begin{document}$${A\widehat{\otimes}B}$$\end{document} is Arens regular if and only if A⊗hB\documentclass[12pt]{minimal}
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\begin{document}$${A\otimes^{h}B}$$\end{document} and B⊗hA\documentclass[12pt]{minimal}
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\begin{document}$${B\otimes^{h}A}$$\end{document} are, where ⊗h\documentclass[12pt]{minimal}
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\begin{document}$${\otimes^h}$$\end{document}, ⊗γ\documentclass[12pt]{minimal}
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\begin{document}$${\otimes^{\gamma}}$$\end{document}, and ⊗^\documentclass[12pt]{minimal}
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\begin{document}$${\widehat{\otimes}}$$\end{document} are the Haagerup, the Banach space projective tensor norm, and the operator space projective tensor norm, respectively.
