Herbert Errol "Bert" Cook was a New Zealand rugby union and professional rugby league football player of the 1940s and "50s, and rugby league coach of the 1950s, playing representative level rugby union for New Zealand Army, and playing representative level rugby league for Other Nationalities, and at club level for Leeds, Keighley, and Dewsbury, as a fullback, id est (that is) number 1, and coaching club level rugby league for Keighley, and Dewsbury.