Thomas Farnham may refer to:

• Thomas J. Farnham (1804–1848), explorer and author of the American West
• Thomas Farnham (Brookside)
• Thomas Farnham (MP) (died 1562), Member of Parliament for Gatton, Leicester and East Grinstead

• Grythyttan School of Hospitality, Culinary Arts & Meal Science
• Grythytte and Haellefors Mountain District
• Grythytte and Hallefors Mountain District
• Gryting, King of Orkdal
• Gryton
• Grytoy
• Grytoya
• Gryttie
• Gryttjen
• Grytviken, South Georgia
• Grytøy
• Gryunfeld
• Gryunfel'd
• Gryunfeld (disambiguation)
• Gryunfel’d
• Gryvnia
• Gryvnya
• Grywald
• Grywałd
• Gryzewo
• Gryzikamien
• Gryzikamień
• Gryzlawki
• Gryzliny
• Gryzliny, Nowe Miasto County