Electronic Journal of Differential Equations, Vol. 2013 (2013), No. 223, pp. 1-6. Title: Osgood type regularity criterion for the 3D Newton-Boussinesq equation Authors: Zujin Zhang (Gannan Normal Univ., Ganzhou, China) Sadek Gala (Univ. of Mostaganem, Mostaganem, Algeria) Abstract: In this article, we show an Osgood type regularity criterion for the three-dimensional Newton-Boussinesq equations, which improves the recent results in [4]. Submitted June 26, 2013. Published October 11, 2013. Math Subject Classifications: 35B65, 76B03, 76D03. Key Words: Newton-Boussinesq equations; regularity criterion; Osgood type.