Template:Wp-Joan Holland, Duchess of Brittany

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Lady Joan Holland (1350 – October 1384) was Duchess of Brittany as the second wife of John IV, Duke of Brittany. She was the daughter of Joan of Kent and Thomas Holland, 1st Earl of Kent. Her mother's second husband was Edward the Black Prince, and the child of that marriage was King Richard II of England.

Joan Holland's marriage to John IV took place in London in May 1366, but without the approval of King Edward III of England, Joan's step-grandfather, who claimed overlordship of Brittany. The couple had no children.

Joan's death, in her thirties, was politically . In 1386, two years afterwards, John IV married Joan of Navarre, later the queen of King Henry IV of England.