Guillaume I de Coucy

Guillaume I de Coucy
Arms of Guillaume de Coucy: Barry of six, vair and gules
Bornc. 1288
Died1335 (aged 46–47)

Sir Guillaume I de Coucy (died 1335) was a 14th-century French nobleman. He was Lord of Coucy, Oisy, La Fère, Marle and Montmirail.