The flame retardant thermoplastic resin composition according to the present invention comprises (A) about 45 to 95 parts by weight of a polycarbonate resin; (B) about 1 to 50 parts by weight of a rubber modified vinyl graft copolymer; (C) about 0 to 50 parts by weight of a vinyl copolymer; (D) about 1 to 30 parts by weight of a mixture of oligomeric phosphoric acid ester compounds consisting of (d1) about 5 to 99% by weight of an oligomeric phosphoric acid ester compound derived from bisphenol-A and (d2) about 1 to 95% by weight of an oligomeric phosphoric acid ester compound derived from resorcinol, per 100 parts by weight of the sum of (A), (B) and (C); and (E) about 0.05˜5 parts by weight of a fluorinated polyolefin resin, per 100 parts by weight of the sum of (A), (B) and (C).