John Willoughby Baron Willoughby [13012]
- Born: Abt 1323, Eresby, Spilsby, , Lincolnshire, England
- Marriage: Cecily Ufford [13013] in 1343 in Suffolk, England
- Died: 1372 Mar 29 aged about 49
- Buried: Spilsby, , Lincolnshire, England
Ancestral File Number: 8MLW-L8.
John married Cecily Ufford [13013] [MRIN: 6212], daughter of Robert D' Ufford [Earl Of Suffolk] [13059] and Margaret De Norwich Countess Of Suffolk [13060], in 1343 in Suffolk, England. (Cecily Ufford [13013] was born about 1327 in Eresby, Spilsby, , Lincolnshire, England and died before 1372 Mar 29.)
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