OpenMath Workshop 2018 OpenMath is a language for exchanging mathematical formulae across applications (such as computer algebra systems). From 2010 its importance has increased in that OpenMath Content Dictionaries were adopted as a foundation of the MathML 3 W3C recommendation, the standard for mathematical formulae on the Web. Topics of the workshop include • Feature Requests (Standard Enhancement Proposals) and Discussions for going beyond OpenMath 2; • Further convergence of OpenMath and MathML 3; • Reasoning with OpenMath; • OpenMath on the Semantic Web; • New OpenMath Content Dictionaries; • Software using or processing OpenMath; June 2018, James Davenport & Michael Kohlhase Copyright c by the paper’s authors. Copying permitted for private and academic purposes. In: O. Hasan, J. Davenport, M. Kohlhase (eds.): Proceedings of the 29th OpenMath Workshop, Hagenberg, Austria, 13-Aug-2018, published at http://ceur-ws.org