Brien Ibrican Cokayne, 1st Baron Cullen of Ashbourne KBE (born Brien Ibrican Adams; 12 July 1864 – 3 November 1932) was a British businessman and banker.

Appointed a Knight Commander of the Order of the British Empire in 1917,[1] in 1920 he was raised to the peerage as Baron Cullen of Ashbourne, of Roehampton in the County of Surrey,[2] a revival of the Cullen title held by his paternal ancestors.

He was also appointed a Grand Cordon of the Order of the Sacred Treasure by Japan.

[3] Lord Cullen of Ashbourne married Grace Margaret, daughter of Reverend the Hon.

He died in November 1932, aged 68, and was succeeded in the barony by his eldest son Charles.