Yefimov () 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

  1. 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

  1. 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