Viscount Chelmsford is a title in the Peerage of the United Kingdom. The Viscountcy is united with the Barony of Chelmsford, created in 1858.

Barons Chelmsford (1858)

• Frederic Thesiger, 1st Baron Chelmsford (1794-1878)
• Frederic Augustus Thesiger, 2nd Baron Chelmsford (1827-1905)
• Frederic John Napier Thesiger, 3rd Baron Chelmsford (1868-1933), created Viscount Chelmsford

Viscounts Chelmsford (1921)

• Frederic John Napier Thesiger, 1st Viscount Chelmsford (1868-1933)
• Andrew Charles Gerald Thesiger, 2nd Viscount Chelmsford (1903-1970)
• Frederic Jan Thesiger, 3rd Viscount Chelmsford (1931-1999)
• Frederic Corin Piers Thesiger, 4th Viscount Chelmsford (b. 1962)