Dear All, We invite participation in OPT 2019, the 11th International Workshop on Optimization for ML. This workshop is a satellite event to the Neurips 2019 conference, and we have worked hard to co-locate it both in space and time with the Workshops of the main conference (to the extent possible). Please visit http://opt-ml.org for submission details — over the past decade this workshop has brought together interested people from both OPT and ML communities, and we hope to continue in that exciting direction this year too. Thanks, Suvrit