This document summarizes the input of the Belgian scientists to the European Strategy Group (ESG) in the context of the upcoming European strategy update for particle physics research. The Belgian HEP community (permanent researchers from particle and astroparticle physics) met in Brussels on September 12th, 2018. During this meeting we took stock of our current activities, evaluated our current person power and growth potential and discussed our individual and common interest in future collider and non-collider based high energy physics experiments. Our feedback to the ESG consists of a short overview of the Belgian tradition and current involvements in experimental HEP, followed by our opinions and priorities on future large-scale HEP projects. A separate statement from the nuclear physics community in Belgium is added in an addendum.