The 31-year-old, one of Silicon Valley's most visible leaders, did not say who would be running the company while he is out. Facebook did not immediately respond to an inquiry.
Facebook, the world's biggest online social network, allows its U.S. employees to take up to four months of paid maternity or paternity leave, which they can use all at once or throughout the first year of their child's life, which is generous by U.S. standards. Zuckerberg announced in July that he and his wife, Priscilla Chan, were expecting a baby girl.