Electronic Journal of Differential Equations, Vol. 2008(2008), No. 79, pp. 1-15. Title: Spatial patterns for the three species Gross-Pitaevskii system in the plane Authors: Marco Caliari (Univ. di Verona, Italy) Marco Squassina (Univ. di Verona, Italy) Abstract: In this paper we highlight some particular spatial patterns of ground state solutions for the three species Gross-Pitaevskii system in the plane having physical coefficients with particular attention to the cases where the inter-species coefficients become large. The solutions models least energy stationary states of a mixture of three Bose-Einstein condensates. Submitted March 14, 2008. Published May 28, 2008. Math Subject Classifications: 35B40, 35Q55, 81V05, 81V45. Key Words: Mixtures of Bose-Einstein condensates; spatial segregation; Gross-Pitaevskii vector equation; ground state solutions; Thomas-Fermi approximation.