Rate coefficients for the reactions of OH radicals with monoethylene glycol monoalkyl ethers have been determined by the competitive method at 297 +/- 3 K. Relative to the value k(OH+hexanol) = 12.5 x 10(-12) cm(3) molecule(-1) s(-1), the rate coefficients are as follows (in units of 10(-12) cm(3) molecule(-1) s(-1)) : methoxyethanol, 10.8 +/- 1.1; ethoxyethanol, 14.5 +/- 0.4; propoxyethanol, 16.4 +/- 0.7; butoxyethanol, 19.4 +/- 2.0. In a second set of experiments relative rate coefficients were measured for the same series of glycol ethers (TST) against heptanol. In all cases the values of k(TST)/k(heptanol) divided by k(TST)/k(hexanol) yielded values of k(heptanol)/k(hexanol) consistent with our experimentally determined value of k(heptanol)/k(hexanol) = 1.24 +/- 0.08. The results are discussed with respect to literature data and structure activity relationships, and the tropospheric lifetimes of the glycol ethers are estimated.