text: An seni sit uxor ducenda (On Marriage in Old Age, 1436);
  De infelicitate principum (On the Unhappiness of Princes, 1440);
  De nobilitate (On Nobility, 1440): Poggio, a self-made man, defends true nobility as based on virtue rather than birth, an expression of the meritocracy favored by the rich bourgeoisie;
  De varietate fortunae (On the Vicissitudes of Fortune, 1447);
  Contra hypocritas (Against Hypocrisy, 1448);
  Historia disceptativa convivialis (Historical discussions between guests after a meal) in three parts (1450):
  1) on expressions of thanks
  2) on the dignity of medical versus legal profession (a reprise of Salutati's 1398 treatment of the same subject, De Nobilitate Legum et Medicinae): Niccolo Niccoli, appealing to the lessons of experience, is arguing that laws are imposed by the will of the stronger to hold the state together − not God-given to rulers, nor a fact of nature − leading biographer Ernst Walser to conclude that "Poggio, in his writing, presents Machiavellism before Machiavelli."
  3) on literate Latin versus vernacular Latin in classical Rome; Poggio concludes that they were both the same language, not two distinct idioms.
  De miseria humanae conditionis (On the Misery of Human Life, 1455), reflections in his retirement in Florence inspired by the sack of Constantinople.