Pierre Landais (French pronunciation: [pjɛʁ lɑ̃dɛ]; 1430–1485) was a Breton politician who became the principal adviser and chief minister to Francis II, Duke of Brittany.

Landais is also important for the key role he played during attempts by the Yorkist kings of England to extradite the leading Lancastrian contender for the English throne, Henry Tudor, who was living in Brittany with his principal supporters.

Landais managed to ensure Chauvin's arrest and dismissal on corruption charges, securing his own position as de facto prime minister under Francis.

Led by John IV of Chalon-Arlay, Prince of Orange, an armed gang attempted to capture Landais, but he escaped.

The king offered to send 4,000 English and Welsh archers to help secure the Duke's power against the rebel Breton nobility, who were continuing to plot against Landais.

He assembled an armed force in Rennes, to march to Vannes and capture all of the Lancastrians, who by this time numbered around 300, including many experienced soldiers.

Facing arrest and extradition to England, Henry and Jasper fled across the nearest border into Anjou, crossing only hours ahead of Landais' troops.

The coup exposed the weakness of Duke Francis, which was soon exploited by Anne of Beaujeu, resulting in a full-scale French invasion of Brittany in 1488.

[2] The English chronicler Raphael Holinshed described Landais (who he calls "Peter Landois") as "a man both of pregnant wit and great authority, [who] ruled and adjudged all things at his pleasure and commandement, for which cause (as men set in authority be not best beloved) he excited and provoked against him the malice and evil will of the nobility of Britaine [Brittany]".

According to Arthur Le Moyne de La Borderie French historians of the ancien regime were generally very negative in their estimation of him.

Alain Bouchart (who wrote around thirty years after the death of the treasurer-general) represents him as 'a person of a little wisdom and of base extraction'".

De la Borderie quotes D'Agentré, who says Landais was a virtual dictator, "no-one could get anything except through him: estates, offices, benefices, hung on his whims...His position made him so arrogant and haughty that he misused princes, lords and gentry alike."