Mikko Tuomi is a Finnish astronomer most known for his contributions to the discovery of the exoplanet Proxima Centauri b together with other scientists at the University of Hertfordshire. Other exoplanets to whose discovery or study Tuomi has contributed include HD 40307, HD 154857 c, Kapteyn c, Gliese 682 c, HD 154857, Gliese 221, Gliese 581 g and the planetary system orbiting Tau Ceti.