  Elastic light-by-light scattering, $\gamma\gamma\to\gamma\gamma$, can be
measured in electromagnetic interactions of lead (Pb) ions at the Large Hadron
Collider (LHC) and Future Circular Collider (FCC), using the large (quasi)real
photon fluxes available in ultraperipheral collisions. The
$\gamma\gamma\to\gamma\gamma$ cross sections for diphoton masses
m$_{\gamma\gamma}>$ 5 GeV in pp, pPb, and PbPb collisions at LHC ($\sqrt{\rm
s_{_{NN}}}$ = 5.5, 8.8, 14 TeV) and FCC ($\sqrt{\rm s_{_{NN}}}$ = 39, 63, 100
TeV) center-of-mass energies are presented. The measurement has controllable
backgrounds in PbPb collisions, and one expects about 70 and 2500 signal events
per year at the LHC and FCC respectively, after typical detector acceptance and
reconstruction efficiency selections.
