As part of our ongoing effort to measure exoplanet sizes and transit timeswith greater accuracy, we present I band observations of two transits ofOGLE-TR-111b. The photometry has an accuracy of 0.15-0.20% and a cadence of 1-2minutes. We derive a planetary radius of 1.067 +/- 0.054 Jupiter radii and astellar radius of 0.831 +/- 0.031 solar radii. The uncertainties are dominatedby errors in the photometry, rather than by systematic errors arising fromuncertainties in the limb darkening function or the stellar mass. Both thestellar radius and the planetary radius are in agreement with theoreticalexpectations. The transit times are accurate to within 30 seconds, and allow usto refine the estimate of the mean orbital period: 4.0144479 +/- 0.0000041days.
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