Ronalds is a surname and a given name. Notable people with the name include:

• Albert Francis Ronalds, Australian civil engineer
• Alfred Ronalds, fly fishing author, artist and Australian pioneer
• Andrew Ronalds, Australian politician and company director
• Edmund Ronalds (1819–1889), English chemist
• Emily Ronalds (1795–1889), English social reformer
• Fanny Ronalds, Mary Frances "Fanny" Ronalds (1839–1916), American socialite and amateur singer
• Sir Francis Ronalds (1788–1873), English scientist and inventor who built the first working electric telegraph
• Hugh Ronalds (1760–1833), British nurseryman, horticulturalist and author

This name is the Latvian equivalent of Ronald. See Latvian name for explanation.

• Ronalds Arājs (born 29 November 1987), Latvian athlete
• Ronalds Cinks (born 11 March 1990), Latvian professional ice-hockey player
• Ronalds Ķēniņš (born February 28, 1991), Latvian professional ice hockey forward
• Ronalds Žagars (born 1950), Latvian football goalkeeper
• Ronalds Zaķis (born 1987), Latvian basketball player