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Yefimov (Russian: Ефимов) or Yefimova (feminine; Ефимова) is a Russified surname of Greek origin with a Russian suffix ‘’’ov’’’. Alternate spellings include ‘’’Efimov and Efimoff’’’. And may refer to:

Yefimov or Efimov

• Alexander Yefimov (1923–2012), a Soviet aircraft pilot and twice Hero of the Soviet Union
• Boris Efimov (1900–2008), a Soviet political cartoonist and propaganda artist
• Igor Yefimov (philosopher) (1937–2020), an American philosopher, writer, and publisher of Russian origin
• Mikhail Efimov (1881–1919), a Russian aviation pioneer

  2754 Efimov, an asteroid named after Mikhail Efimov

• Mikhail Yefimov (born 1978), Russian football player
• Nikolai Efimov (1910–1982), a Russian mathematician
• Sergei Yefimov (1922–1994), a Soviet army officer and Hero of the Soviet Union
• Sergei Efimov (born 1987), a Russian footballer
• Vitaly Efimov (born 1938), a Russian theoretical physicist

  The Efimov state is named after Vitaly Efimov.

• Vitaly Efimov (politician) (born 1940), Russian politician
• Vladimir Yefimov (1949–2012), a Russian type designer, typesetting font artist, theorist and teacher
• Vyacheslav Yefimov (1923–1943), a Soviet army officer and Hero of the Soviet Union

Yefimova or Efimova

• Aleksandra Efimova, a Russian-American art entrepreneur
• Alisa Efimova (born 1999), a Finnish-Russian pair skater
• Alla Efimova, a Russian-American art historian
• Ekaterina Efimova (born 1993), a Russian volleyball player
• Emma Yefimova (1931 – 2004), a Soviet fencer
• Natalia Efimova (born 1983), a Russian orienteering competitor
• Nina Simonovich-Efimova (1877 – 1948), a Russian visual artist and puppeteer
• Olga Efimova (born 1990), another Russian volleyball player
• Yuliya Yefimova (born 1992), a Russian competitive swimmer