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We study the relationship between galaxy colour, stellar mass and local galaxy density in a deep near‐infrared imaging survey up to a redshift of   z ∼ 3  using the GOODS (Great Observatories Origins Deep Survey) NICMOS (Near Infrared Camera and Multi‐Object Spectrometer) Survey (GNS). The GNS is a deep near‐infrared  Hubble Space Telescope  survey imaging a total of 45 arcmin 2  of the GOODS fields, reaching a stellar mass completeness limit of   M  * = 10 9.5  M ⊙   at   z = 3 . Using these data, we measure galaxy local densities based on galaxy counts within a fixed aperture, as well as the distance to the third, fifth and seventh nearest neighbour. We compare the average rest‐frame  ( U − B )  colour and fraction of blue galaxies in different local densities and at different stellar masses. We find a strong correlation between colour and stellar mass at all redshifts up to   z ∼ 3 . Massive red galaxies are already in place at   z ∼ 3  at the expected location of the red sequence in the colour–magnitude diagram, although they are star forming. We do not find a strong correlation between colour and local density; however, there may be evidence that the highest overdensities are populated by a higher fraction of blue galaxies than average or underdense areas. This could be indicating that the colour–density relation at high redshift is reversed with respect to lower redshifts (  z  &lt; 1 ), where higher densities are found to have lower blue fractions. Our data suggest that the possible higher blue fraction at extreme overdensities might be due to a lack of  massive  red galaxies at the highest local densities.

Galaxy properties in different environments up to z ∼ 3 in the GOODS NICMOS Survey