Tamm is a surname.

"Tamm" is one of the most common surnames in Estonia.^[1] The word "tamm" in Estonian means "oak".

People with the surname Tamm include:

• Aino Tamm (1864–1945), Estonian singer and pedagogue
• Aldo Tamm (born 1953), Estonian politician
• Alex Matthias Tamm (born 2001), Estonian footballer
• Edward Allen Tamm (1906–1985), American FBI agent and federal judge (brother of Quinn Tamm)
• Fabian Tamm (1879–1955), Swedish admiral
• Hugo Tamm (1903–1990), Swedish diplomat
• Igor Tamm (1895–1971), Soviet physicist, 1958 Nobel Prize for Physics
• Ilmar Tamm (born 1972), Estonian Brigadier General
• Jaak Tamm (1950–1999), Estonian politician and businessman
• Joonas Tamm (born 1992), Estonian footballer
• Jüri Tamm (1957–2021), Estonian hammer thrower
• Kiiri Tamm (born 1962), Estonian actress
• Kristjan Tamm (born 1998), Estonian tennis player
• Mary Tamm (1950–2012), British actress
• Peter Tamm (1928-2016), German journalist and collector
• Quinn Tamm (1910–1986), American FBI agent and jurist (brother of Edward Allen Tamm)
• Raivo E. Tamm (born 1965) Estonian actor
• Ralph Tamm (born 1966), American football player
• Reimo Tamm (born 1984), Estonian basketball player
• Riin Tamm (born 1981), Estonian geneticist
• Sebastian Tamm (1889–1962), Swedish rower
• Sri Rama Michael Tamm (1911-2002), Estonian mystic and guru
• Tarmo Tamm (born 1953), Estonian politician
• Tarmo Tamm (born 1966), Estonian entrepreneur and politician
• Thomas Tamm (born 1952), American whistleblower
• Tiit Tamm (born 1952), Estonian ski jumper and coach
• Väino Tamm (1930–1986), Estonian interior designer and professor
• Viking Tamm (1896–1975), Swedish Army officer