The rate constants for the reactions of OH with ClO, Cl2, and Cl2O at 298K have been determined in a discharge flow system using resonance fluorescence detection. The results are (9.1¿1.3) ¿ 10-12, (5.5¿0.3) ¿ 10-14, and (6.5¿0.5) ¿ 10-12 (all in units of cm3 sec-1), respectively. In the reaction of OH and ClO the reaction product HO2 has been detected indirectly, and a lower limit of 65% has been established for the OH + ClO→HO2 + Cl channel.