The measurement of the Higgs trilinear self-coupling is an important part of the LHC Higgs program at 14 TeV, which directly interrogates the mechanism of electroweak symmetry breaking in the Standard Model. Directly probing the Higgs trilinear requires double Higgs production, and recent studies have uncovered a number of different ways this quantity can be constrained in the high energy LHC run. I will also discuss the impact that Beyond the Standard Model physics can have on di-Higgs physics, and some preliminary prospects for di-Higgs production at a future 100 TeV hadron collider.