During the 1919–20 English football season, Brentford competed in the Southern League Division One. In the first season of competitive football since the end of the First World War in November 1918, Brentford consolidated with a mid-table finish. It was the club's final Southern League season, as 21 of the 22 Division One clubs would be voted into the new Football League Third Division in May 1920.

Despite talk that Brentford would seek election to the Football League after the London Combination title success of the previous season, the directors of the club decided to remain in the Southern League. As it was, with the resumption of the Southern League after the First World War, Brentford, Merthyr Town, Swansea Town and Newport County were elevated from Division Two to Division One by virtue of Division One having been expanded to 22 clubs, with West Ham United (voted into the Football League) and Croydon Common (resigned) having left the Southern League.

Four years of war meant that secretary-manager Fred Halliday needed to rebuild and expand his squad, with prolific forwards Henry White and guest Jack Cock having left the club, in addition to full backs Jack Peart, Dusty Rhodes and half back Bill Stanton. The only survivors of Brentford's final pre-war squad to make an appearance during 1919–20 would be goalkeeper Ted Price, half back Tom McGovern and outside left Patsy Hendren.

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