Rice is the most important food crop of the developing world and is the staple food of more than half of the world’s population. Rice is considered as self-pollinated crop but out-crossing is possible. High seed cost is a major factor limiting the adoption of hybrid rice in South and Southeast Asian countries. A practical way to improve hybrid seed production is to increase the outcrossing rate in rice. Several studies reveal that perennial wild Oryza species have a higher outcrossing rate than annual species. The Asian wild rice, Oryza rufipogon, has partial outcrossing behavior and shows high levels of genetic variation. Outcrossing potential in rice depends on the floral characteristics of the female and male parents. The most important floral trait influencing outcrossing in the female parent is male sterility. The extent of outcrossing in the seed parent is influenced by floral traits such as stigma size (length and breadth), length of style, stigma exertion, and angle and duration of glume opening; in the pollen parent, anther size, number of pollen grains per anther, filament length, and duration of spikelet blooming.