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Ink composition, ink set, and method for forming image

Disclosed is an ink composition containing a pigment, water, a (meth)acrylamide compound represented by general formula (1), a polymerization initiator, and polymer particles having a glass transition temperature of 90°C or higher. In general formula (1), the plurality of R 1 each independently represent a hydrogen atom or a methyl group, and the plurality of R 2 each independently represent a C 2 -C 4 straight-chain or branched alkylene group. In the formula, there is no instance of a structure in which an oxygen atom and a nitrogen atom bonded at both ends of R 2 are bonded to the same carbon atom in R 2 . The plurality of R 3 each independently represent a divalent linking group. The plurality of k each independently represent a 2 or a 3. In the formula, x, y, and z each independently represent an integer of 0-6, and x + y + z is 0-18.