Einstein is a German-Jewish surname. "Ein stein" is German for "a rock". It is strongly associated with German-born American physicist Albert Einstein. People with the surname include:
- Albert Einstein (1879–1955)
- Einstein family, including:
- Mileva Einstein (née Marić) (1875–1948), Serbian physicist and mathematician, first wife of Albert Einstein
- Hans Albert Einstein (1904–1973), Swiss-American engineer, son of Albert and Mileva
- Bernhard Caesar Einstein (1930–2008), German-American physicist, son of Hans Albert Einstein, grandson of Albert Einstein
- Thomas Helmut Einstein (born 1955), anesthesiologist and physician, son of Bernhard Caesar Einstein, great-grandson of Albert Einstein
- Bernhard Caesar Einstein (1930–2008), German-American physicist, son of Hans Albert Einstein, grandson of Albert Einstein
- Eduard Einstein (1910–1965), second son of Albert and Mileva
- Hans Albert Einstein (1904–1973), Swiss-American engineer, son of Albert and Mileva
- Elsa Einstein (1876–1936), cousin and second wife of Albert Einstein
- Mileva Einstein (née Marić) (1875–1948), Serbian physicist and mathematician, first wife of Albert Einstein
- Hans Einstein (1923–2012), physician, grandson of a first cousin of Albert Einstein
- Alfred Einstein (1880–1952), musicologist and distant cousin of Albert Einstein