| Margaret Holland | |
| Countess of Somerset Duchess of Clarence | |
| Birth Date: | 1385 |
| Death Date: | 30 December 1439 (aged 54) |
| Death Place: | Bermondsey Abbey, London, England |
| Burial Place: | Canterbury Cathedral, Kent |
| Spouse: | John Beaufort, 1st Earl of Somerset (m. 1397, died 1410) Thomas of Lancaster, Duke of Clarence (m. 1411, died 1421) |
| Spouse-Type: | Spouse |
| Noble Family: | Holland family |
| House-Type: | Dynasty |
| Father: | Thomas Holland, 2nd Earl of Kent |
| Mother: | Alice FitzAlan |
Margaret Holland (1385 – 30 December 1439) was a medieval English noblewoman. She was a daughter of Thomas Holland, 2nd Earl of Kent, who was the son of Joan "the Fair Maid of Kent" (granddaughter of Edward I of England, wife of Edward the Black Prince and mother of Richard II of England). Margaret's mother was Alice FitzAlan, daughter of Richard FitzAlan, 10th Earl of Arundel and Eleanor of Lancaster.
Margaret married John Beaufort, 1st Earl of Somerset, son of John of Gaunt and his mistress Katherine Swynford. They had six children:[1]
In 1399, she was invested as a Lady Companion, Order of the Garter (L.G.).[2] After Beaufort died in 1410 (in the Tower of London), she married his nephew Thomas of Lancaster, Duke of Clarence (1387–1421), the son of King Henry IV. They had no children. She died on 30 December 1439 at St. Saviour's Abbey, Bermondsey, in London, England. Margaret and both her husbands are buried together in a carved alabaster tomb in Canterbury Cathedral that shows her lying between the two of them.
Through her son John, the 1st Duke of Somerset, Lady Margaret is an ancestress to the Tudor monarchs.[3]