Manasses I may refer to:

(died 918). count of Chalon and Langres (as Manasses I) (10th century) (died 993), bishop of Troyes (as Manasses I) Manasses I of Guînes (11th century), also called Manasses the Old Manasses I (archbishop of Reims) (died after 1081) (died 1120)

See also Manasses II Manasses III