Claude Louis Marie Joseph Arnould (10 May 1899 – 22 December 1978), also known as Colonel Arnould, Colonel Ollivier and other codenames, was a French officer, intelligence agent, resistance leader, businessman and diplomat. During World War II, he was the co-leader of the Jade-Amicol resistance network under the auspices of the British Secret Intelligence Service (SIS), commonly known as MI6.