Events in the year 1821 in Art.

• At the age of eleven, Théodore Chassériau is accepted into the studio of Ingres.
• John Martin's paintings Joshua Commanding the Sun to Stand Still upon Gibeon and Belshazzar's Feast are purchased by his former employer William Collins and begin to tour.
• Birmingham Society of Artists established in England.

• Edward Hodges Baily – Eve at the Fountain
• Lorenzo Bartolini – The Campbell Sisters Dancing a Waltz (marble)
• William Beechey – Victoria, Duchess of Kent with Princess Victoria
• John Constable – The Hay Wain
• William Etty – The Triumph of Cleopatra
• Théodore Géricault – The 1821 Derby at Epsom
• Charles Bird King – Young Omahaw, War Eagle, Little Missouri, and Pawnees
• Thomas Lawrence – Portrait of George IV
• Bertel Thorvaldsen – Lion Monument, Lucerne
• John Trumbull – Surrender of General Burgoyne

• January 27 – August Becker, German landscape painter (died 1887)
• February 10 - Roberto Bompiani, Italian painter (died 1908)
• February 26 – Félix Ziem, French painter (died 1911)
• March 9 – Napoleon Sarony, Canadian American portrait photographer (died 1896)
• April 16 – Ford Madox Brown, English painter (died 1893)
• April 21 – Philip Henry Delamotte, English pioneer photographer (died 1889)
• April 26 – Robert Adamson, Scottish pioneer photographer (died 1848)
• June 18 – Théophile Schuler, French painter and illustrator (died 1878)
• August 4 – Louis Vuitton, French fashion designer (died 1892)
• August 28 – Thomas Seddon, English-born landscape painter (died 1856)
• September 9 – James Smetham, English painter (died 1889)
• October 13 – Évariste Vital Luminais, French historical painter (died 1896)
• November 23 – Charles Meryon, French etcher (died 1868)
• Robert S. Duncanson, African American landscape painter (died 1872)
• date unknown
• Mario Raggi - Italian sculptor (died 1907)

• February 12 – Albertus Jonas Brandt, Dutch still-life painter (born 1788)
• February 24 – Marie-Anne Collot, French sculptor (born 1748)
• March 9 – Nicholas Pocock, English marine painter (born 1740)
• April 18 – Thomas Baxter, English porcelain painter (born 1782)
• April 22 – John Crome, English artist in the Romantic era (born 1768)
• May 27 – Charles Alfred Stothard, English historical draughtsman (born 1786)
• July 4 – Richard Cosway, English portrait painter (born 1742)
• August 19 – Marie-Denise Villers, French painter specializing in portraits (born 1774)
• August 21 – Adam Bartsch, Austrian scholar, artist, and printmaker in engraving and etching (born 1757)
• September 10 – Johann Dominicus Fiorillo, German painter and art historian (born 1748)
• date unknown
  • Luigi Agricola, Italian painter and jeweler (born 1750)^[1]
  • Gaetano Stefano Bartolozzi, Italian engraver, art dealer, and merchant (born 1757)^[2]
  • Yi In-mun, Korean court painter of the late Joseon Dynasty, primarily of landscapes (born 1745)