Scanning electrochemical microscopy (SECM) was used to study the kinetics of hydrogen oxidation on platinum, iridium, and rhodium substrates in acidic media. Hydrogen was generated at a platinum tip by reduction of H+ and oxidized at a Pt, Ir, or Rh substrate. The Tafel slope (117 mV, corresponding to a transfer coefficient, alpha, of 0.50) and the rate constant for hydrogen oxidation on Pt obtained by fitting approach curves (0.22 cm/s at the halfwave potential) agree with a previous SECM result. Kinetic data were also obtained on Ir (Tafel slope = 113 mV, kdegrees = 0.25 cm/s, alpha = 0.48), and Rh (Tafel slope = 138 mV, kdegrees = 0.010 cm/s, alpha = 0.58) substrates. These results demonstrate that hydrogen oxidation on Pt and Ir occurs at a similar rate, but is much slower on Rh.