Giedraitis (Polish: Giedroyć) is the name of a Lithuanian noble family, most probably dating back to the time of Mindaugas, although it has no connections with him. No reliable information about the earliest members of the family has survived; when the family name started to appear in written sources in the early 15th century, the precise connections between all its members were already impossible to establish. According to the 16th century Lithuanian Chronicle, they are descendants of duke Giedrius, a brother of Narimantas and Grand Duke of Lithuania Traidenis.
Many family members were important figures in Lithuanian and Polish history and culture.
The family's original domain was the Lithuanian town of Giedraičiai.