Sir Roger de Mowbray of Barnbougle and Dalmeny (d. 1320), was 13th-14th century Scottish noble.
He held the office of Standard Bearer of Scotland and signed the Declaration of Arbroath in 1320 and then was arrested later in 1320 for treason for plotting to overthrow King Robert I.
Roger's corpse was brought to Parliament in a litter and was found guilty and sentenced to be drawn, hanged and beheaded.
His lands of Barnbougle and Dalmeny, Inverkeithing, Cessford and Eckford, Methven, Kellie and Kirk Michael were forfeited to the Crown.
A concession of dispensation for marriage between Roger and Margaret, daughter of Alexander of Abernethy was granted in 1312.