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. P 1 and P 2 represent a polymer chain consisting of polyester and the like and having a number-average molecular weight of 500 or greater, Z 11 represents a (n 1 +1)-valent group, Z 12 represents a (m 1 +1)-valent group, m 1 , n 1 and n 2 each represent an integer of 1 or greater, X 1 represents a single bond, a -CH 2 - group, or a -NH- group, Z 21 represents a (n 2 +1)-valent group, R 1 represents a hydrocarbon group that may include a hetero atom.