Second Lieutenant Patrick Anthony Langan Byrne DSO (1895 – 16 October 1916) was an Irish flying ace of the First World War credited with ten aerial victories.

[1] Byrne was born in Clogherhead, County Louth, the son of Dr. and Mrs. J. V.

[3] Langan-Byrne was commissioned as a temporary second lieutenant in the Royal Field Artillery on 9 October 1914,[4] serving in 129th Battery, 30th Brigade.

Three days later, he drove a German fighter aircraft down out of control for his second win.

He led "B" Flight right for Oswald Boelcke, commander of Jasta 2, who promptly killed him for the German ace's 34th victory.