In this talk, I will discuss a possible connection between dark matter (DM) and one-loop induced top quark FCNC decays. In a simplified t-channel DM model that extends the SM with one colored scalar mediator and one right-handed fermion both odd under an ad-hoc Z_2 symmetry, I will show that that moderate to large rates of the top quark FCNC decays are possible while respecting the existing constraints. Then I will discuss the phenomenological implications at hadron colliders (HL-LHC and FCC-hh) of four phenomenologically viable scenarios.