We are pleased to announce the 2nd Workshop on *The Mathematics of Subjective Probability (MSP2020)* to be held in Milano, on 2-4 september 2020 at Università Milano-Bicocca. Plenary speakers will be: Nabil A-NAJJAR, Kellog, Northwestern; Bhaskara-Rao KOPPARTY, Indiana University Northwest; Pierpaolo BATTIGALLI, Università Bocconi; Giulianella COLETTI, Università di Perugia; Massimo MARINACCI, Università Bocconi; Frank RIEDEL, University of Bielefeld. More information, including a non exhaustive list of topics, are available at the conference website, https://www.msp2020.campus.unimib.it/ <https://www.msp2020.campus.unimib.it/home> We invite all researchers in the areas of probability, statistics, economics, game theory to submit papers for presentation at the Workshop. *Important dates*: March 1, Submission starts; July 15, Acceptance notification; March 1, Registration starts THE ORGANIZING COMMITTEE: Gianluca Cassese (Università Milano-Bicocca); Pietro Rigo (Università di Bologna); Barbara Vantaggi (Università La Sapienza, Roma).