If you know of other schools that are not listed here, please reach out to me. Like in previous posts (Summer 2016, Winter 2016 / 2017, and Summer 2017), I may add schools with past deadlines as reference for readers looking for schools in the next years.
PS: There is a more recent post covering Winter schools for 2018 / 2019
SESO 2017 Winter School “Data, Uncertainty and Optimization”
November 28-30 (deadline: October 20)
Luminy, France
Recent Advances in Parameterized Complexity
December 3-7 (deadline: October 15)
Tel Aviv, Israel
* Included on October 11
13th Summer School on Discrete Math
January 8-12 (deadline: October 27)
Valparaiso, Chile
Winter School on Optimization and Operations Research: Data Science and Optimization
January 14-19 (deadline: December 16 for early registration)
Zinal, Switzerland
Data61 6th International Optimisation Summer School
January 14-19 (no deadline: first come, first served registration)
Kioloa, Australia
7th Winter School on Network Optimization
January 15-19 (deadline: November 30 for early registration)
Estoril, Portugal
4th International Winter School on Big Data
January 22-26 (deadline: October 19)
Timişoara, Romania
International Research School on Graph Limits
January 22-26 (deadline not posted)
Lyon, France
* Included on November 27
2018 School on Column Generation
February 26 – March 2 (deadline: December 15)
Paris, France
* Included on October 17
2018 Operations Research Summer School for Young Latin American Schoolars (ELAVIO) March 5-9 (deadline not posted)
Marbella Resort, Chile
2018 EURO Winter Institute on Lot Sizing and Related Topics
March 5-16 (deadline: October 31)
Frankfurt an der Oder, Germany
Intensive Research Program in Discrete, Combinatorial and Computational Geometry
April 16 – June 8 (deadline: February 28 for early registration)
Barcelona, Spain
ISCO 2018 Spring School “Advanced MIP Formulations and Computations”
April 9-10 (deadline: January 10)
Marrakesh, Morocco
* Included on November 1
Thiago Serra 