Robert Willoughby, 6th Baron Willoughby de Eresby KG (c. 1385–25 July 1452) was an English baron in the 15th century. He was the son of William Willoughby, 5th Baron Willoughby de Eresby and Lucy, née le Strange.
On his father's death on 4 December 1409 he succeeded him as Baron Willoughby de Eresby. And in 1416 he was invested as Knight of the Garter.
He married twice, firstly before 21 February 1421 Lady Elizabeth Montagu, with whom he had a daughter, Joan, and secondly before 9 January 1449 Maud Stanhope.
On his death, the barony passed to his daughter and only child Joan (d. 1462).
He was buried in Mettingham, Suffolk.
| Peerage of England | ||
|---|---|---|
| Preceded by William Willoughby |
Baron Willoughby de Eresby 1409-1452 |
Succeeded by Joan Willoughby |