Research reports relating peanut (Arachis hypogaea L.) response to gypsum at varying soil Ca levels are limited for the runner types and non-existent for the Virginia type NC-7. Twenty-nine gypsum experiments were conducted from 1982 to 1987 with Florunner on six soils. Seven gypsum experiments were conducted on four soils with Virginia types, six with NC-7 and one with Early Bunch. Pod yields of Florunner peanuts were increased by gypsum in 4 of 10 experiments with Mehlich-1 soil Ca ranging from 221 to 538 kg/ha and in all 7 Virginia type peanut experiments with soil Ca ranging from 168 to 1559 kg/ha. However, soil Ca concentration influenced the degree of response of the Virginia types since pod yield response to gypsum declined with increased soil Ca concentration and reached 95% of maximum yield at 1544 kg soil Ca/ha. The percentage of sound mature kernels (SMK) of Florunner peanuts was not affected by gypsum, but the SMK and extra large kernels of the Virginia types were increased by gypsum up to 540 kg soil Ca/ha. Soil pH varied from 5.4 to 7.4 and there was a high correlation between soil pH and soil Ca, but there was no indication that soil pH, per se, was influencing the results. Data indicate that the critical soil Ca concentration was at least 538 kg/ha for Florunner peanuts and was near 1600 kg/ha for the NC-7 Virginia type.