A water dispersion of gel particles, in which the gel particles having a three-dimensional crosslinked structure including at least one of Polymer Structure (1) or Polymer Structure (2), having a hydrophilic group and a polymerizable group, and including photopolymerization initiators are dispersed in water, a method of producing the water dispersion, and an image forming method using the water dispersion are provided. P1 and P2 represent a polymer chain consisting of polyester and the like and having a number-average molecular weight of 500 or greater, Z11 represents a (n1+1)-valent group, Z12 represents a (m1+1)-valent group, m1, n1 and n2 each represent an integer of 1 or greater, X1 represents a single bond, a —CH2— group, or a —NH— group, Z21 represents a (n2+1)-valent group, R1 represents a hydrocarbon group that may include a hetero atom.