A liquid developer for electrostatic photography comprising a resin dispersed in a non-aqueous solvent having an electric resistance of at least 10.sup.9 .OMEGA.cm and a dielectric constant of not higher than 3.5, wherein the dispersed resin is a polymer resin obtained by polymerizing a solution containing at least one monofunctional monomer (A) which is soluble in the aforesaid non-aqueous solvent but become insoluble after being polymerized, in the presence of a dispersion-stabilizing resin which is soluble in the aforesaid non-aqueous solvent and at least one oligomer (B) having a number average molecular weight of not more than 1.times.10.sup.4 and having at least one polar group selected from a carboxy group, a sulfo group, a hydroxy group, a formyl group, an amino group, a phosphono group, and ##STR1## wherein R.sup.0 represents a hydrocarbon group or --OR.sup.1, (wherein R.sup.1 represents a hydrocarbon group) bonded to only one terminal of the main chain of a polymer composed of a recurring unit represented by following formula (II): ##STR2## wherein V.sup.1, R.sup.2, a.sup.1 and a.sup.2 are as defined in the specification. The liquid developer is excellent in dispersion stability, re-dispersibility, and fixability, and also is capable of forming an offset printing plate having excellent ink-receptivitiy for printing ink and excellent printing durability by electrophotography.