Guarini is a surname. Notable people with the surname include:
Alessandro Guarini (–1636) Italian writer, jurist and diplomat of the late Renaissance; son of Giovanni Battista Guarini; sometimes called "Guarini the Younger" Alessio Guarini (born 1985), Italian long-jumper Alfredo Guarini (1901–1981), Italian filmmaker Anna Guarini, Contessa Trotti, (1563–1598), Italian virtuoso singer of the late Renaissance Carmen Guarini (born 1953), Argentine anthropologist Francesco Guarini (bishop) (died 1569), Bishop of Imola Francesco Guarino or Guarini (1611–1651 or 1654), Italian painter of the Baroque period Frank Joseph Guarini (1924–2026), American politician Giovanni Battista Guarini (1538–1612), Italian poet and diplomat Giovanni Luigi Guarini (died 1579), Bishop of Aquino Guarino Guarini (1624–1683), Italian architect and Theatine priest Justin Guarini (born 1978), American singer who rose to fame on the television show American Idol Marco Antonio Guarini (1570–1638), Italian historian and scholar Maurizio Guarini (born 1955), Italian rock musician Raimondo Guarini (1765–1852), Italian scholar and man of letters
See also Guarani (disambiguation)