The viability of the olive industry depends on harvesting an economic yield of fruit, which can be used for oil production and table olives. Despite a profusion of flowers on olive trees, only a few set fruit in a growing season. One of the most reasons for this low fruit to flower ratio is pollen compatibility relationships among cultivars. Pollination is one of the most important factors for a good productivity. It is important for growers to understand the pollen compatibility between cultivars when planning an olive orchard in order to maximize fruit set and yields. Therefore, the aim of this study was to determine suitable pollinizer for Conservalia and Fishomi Rodbar olive cultivar which may be increase the productivity and fruit quality.The studies were carried out in two experimental orchards of ‘Conservalia’ and ‘Fishomi Rodbar’ trees located in Kazeron and Shiraz, respectively, in two years. The experiment layout was a randomized complete block design with four replications. For Conservalia cultivar a set of selected shoots on each replication (tree) received the following treatments: self pollination, open pollination, cross pollination with ‘Gordal Sevilano’ pollen, ‘Fishomi Rodbar’ pollen, ‘Roghani’ pollen, and mixture of all cultivars pollen. In second year, the treatments ‘Dakal’ pollen and ‘Koroneiki’ pollen were added to other treatments. For Fishomi Rodbar cultivar treatments in two years were the same and included: self pollination, open pollination, cross pollination with ‘Roghani’ pollen, ‘Zard’ pollen, ‘Tokhm Kabki’ pollen, ‘Dezful’ pollen ‘Shiraz’ pollen, ‘Bash’ pollen, and mixture of all cultivars pollen. For the treatment of pollen mixture, equal amounts (by weight) of pollens of the given cultivars were combined. Pollen collection was carried out by bagging flowering shoots of each pollinizer trees before anthesis and shaking them after full bloom. The collected pollen was stored in small glass bottles at 4 °C until use. Some flowering shoots per host tree were chosen for different crosses. One hundred flowers per shoot were selected just before opening at ballon stage (except self and open pollination treatment), emasculated with forceps and crossed using a fine paintbrush. To avoid unwanted pollen, hands and all equipment were washed with 70% ethanol after every cross. The pollinated shoots (except open pollination treatment) were isolated using paper bags. Twenty days after emasculation paper bags were removed. The percentage of fruit set was calculated in twenty one days after emasculation, mid-summer and harvest time. Also, at harvest time yield and components of fruit and stone were evaluated. Results showed that Conservalia cultivar behaved as a self-compatible cultivar with reduced fruit set under cross-pollination (index of incompatibility 0.91 in first year, and 1.18 in second year). The percentage of fruit set in all stages in treatment of self pollination was significantly greater than cross pollination. The percentage of shot berry was also affected by pollen sources. Flowers pollinated with ‘Conservalia’ pollen showed the least of shot berry percentage compared with cross pollination treatments. In this study, fruit parameters (diameter, length, weight and pulp to stone ratio) in treatments of self pollination, open pollination and pollen mixture were greater than cross pollination treatments. The stone parameters were not affected by pollen sources. Results showed that Fishomi Rodbar cultivar behaved as a partial self-incompatible cultivar with reduced fruit set under self pollination (index of incompatibility 0.52 in first year, and 0.67 in second year). The percentage of fruit set in all stages in treatments of cross pollination with ‘Zard’ pollen and mixure of pollen were significantly most than other treratments. Flowers pollinated with ‘Zard’ pollen and mixture of pollen showed the least of shot berry percentage compared with other treatments. Fruit and stone parameters in treatment of ‘Zard’ pollen was greater than other treatments. In conclusion, the response of ‘Conservalia’ and ‘Fishomi Rodbar’ olive cultivar to different pollen sources in this study suggests that ‘Conservalia’ was a self-compatible cultivar and ‘Fishomi Rodbar’ was a partial self-incompatible cultivar. Key Words : Olive, pollination, self incompatibility, fruit set