The contracts are being awarded by Hub South West Scotland Ltd.
Following financial close, Morrison Construction will build the new Greenfaulds High School in Cumbernauld, under a contract worth up to £26.5m, and the Clyde Valley Schools Campus in Wishaw, which is a £23.2m project.
The new Clyde Valley campus will cater for 1,018 pupils across the full age range from 3-18, while Greenfaulds is designed to take 1,350 secondary school pupils.
Galliford Try chief executive Greg Fitzgerald said: "We are delighted to secure these significant projects which reflect our reputation and strong market presence within the education sector in Scotland. We look forward to successfully delivering both projects for our client and wider stakeholders, and in turn providing pupils, teachers and the communities in North Lanarkshire with an enhanced built environment and improved facilities."