Mercury 2 or variants may refer to:
Mercury 2, a spacecraft of Project Mercury Mercury(II), an oxidation state of the element Mercury Mercury II, a version of the Blackburn Mercury early British aircraft Mercury II, a 1928 version of the Bristol Mercury aircraft engine The Mercury II, a crashed spaceship in the game Subnautica: Below Zero.
See also Mercury (disambiguation) Mercury-Redstone 2, a 1961 space flight test Mercury-Atlas 2, a 1962 space flight test