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We propose to search for millicharged particles in electron collidersoperated with the center-of-mass energies at ${\cal O}$(1-10) GeV, whichinclude Belle II, BESIII, BaBar, and also the proposed experiment STCF. We usethe monophoton final state at electron colliders to probe the parameter spaceof millicharged particles, that is spanned by millicharge $\epsilon$ and mass$m$. We find that electron colliders have sensitivity to the previouslyunexplored parameter space for millicharged particles with MeV-GeV mass:$\epsilon \lesssim {\cal O}(10^{-1})$ for $0.5$ GeV $\lesssim m \lesssim 3.5$GeV in BaBar, $\epsilon \lesssim {\cal O}(10^{-3})$ for $0.1$ GeV $\lesssim m\lesssim 1.5$ GeV in BESIII, $\epsilon \lesssim 10^{-3}-10^{-2}$ for $0.1$ GeV$\lesssim m \lesssim 4$ GeV in Belle II, and $\epsilon \lesssim {\calO}(10^{-4})$ for $1$ MeV $\lesssim m \lesssim 1$ GeV in STCF.

Millicharged particles at electron colliders