Humbert I of Viennois (c. 1240 – 12 April 1307) was baron of la Tour-du-Pin and then also became, by his marriage, dauphin of Viennois. He was the son of Albert III, baron of la Tour-du-Pin, and of Béatrice de Coligny^[1] (herself the daughter of Hugh I, lord of Coligny and of Béatrice d'Albon, dauphine of Viennois).

In 1294, Humbert became a vassal of King Philip IV of France in exchange for £500 annual pension, which would give impetus to the acquisition of the Dauphiné, by King Philip VI of France, fifty years later.^[2]

In September 1273 he married Anne of Burgundy^[3] (daughter of Guigues VII of Viennois) – their nine children were:

• John II (1280 † 1319), succeeded his father as dauphin of Viennois
• Hugues († 1329), baron de Faucigny
• Guigues († 1319), seigneur de Montauban.
• Alix (1280 † 1309), married John I (1275 † 1333), count of Forez in 1296
• Marie, married Aymar de Poitiers-Valentinois
• Marguerite, married Frederick I († 1336), Marquess of Saluzzo in 1303
• Béatrice (1275 † 1347), married Hugh I of Chalon-Arlay in 1312
• Henri (1296 † 1349), bishop of Metz
• Catherine († 1337), married Philip of Savoy (1278 † 1334), count of Piedmont and prince of Achaea in 1312