Insemination is the introduction of sperm into a female's reproductive system for the purpose of impregnating, also called fertilizing, the female for sexual reproduction. The sperm is introduced into the uterus of a mammal or the oviduct of an oviparous (egg-laying) animal. In mammals, insemination normally occurs during sexual intercourse or copulation, but insemination can take place in other ways, such as by artificial insemination.

मादा जन्तु या पादप के जननांग में शुक्राणु (स्पर्म) पहुँचाना वीर्यसेचन कहा जाता है। इसका उद्देश्य लैंगिक प्रजनन द्वारा गर्भधारण कराना होता है।