Is the Higgs Mechanism true to the Equivalence Principle? C. S. Unnikrishnan 1 and George T. Gillies 2 1 Gravitation Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai - 400 005, India 2 School of Engineering and Applied Science, University of Virginia, Charlottesville, VA 22904-4746, USA E-mail address: 1 unni@tifr.res.in, 2 gtg@virginia.edu This essay received honorable mention in the ‘Gravity Research Foundation 2015 Awards for Essays on Gravitation’. Journal reference: Int, Jl. Mod. Phys. D 24, (2015) 1544009. Abstract We raise and discuss the fundamental issue whether the interaction- induced inertia in the Higgs mechanism is the same as the charge of gravity, or the gravitational mass. True physical mass has to fulfill the dual role of inertia and the gravitational charge and should respect the weak equivalence principle. This is not yet addressed in the standard model that does not incorporate gravity. Hence the Higgs scenario still requires a gravitational completion. Some relevant analogies where interaction-induced inertia is not the same as the gravitational charge are mentioned. Probing this line of thought will provide valuable clues and perhaps a remarkable answer to the place and role of gravity in the standard model of particle physics. The Brout-Englert-Higgs solution (commonly called the Higgs mecha- nism) [1, 2] for providing inertial mass to the fundamental particles within the gauge theory description in the standard model is on its way to final confirmation at the Large Hadron Collider, after the discovery of a scalar 1