Peter Higgs and Francois Englert.
Not really a massive (!) surprise but still very well deserved and a vindication of theoretical physics, science and so called “Big Science” experiments.
The official citation for Englert and Higgs reads –
“For the theoretical discovery of a mechanism that contributes to our understanding of the origin of mass of subatomic particles, and which recently was confirmed through the discovery of the predicted fundamental particle, by the Atlas and CMS experiments at Cern’s Large Hadron Collider”.