Dyck is a form of the Dutch surname (van) Dijck, which is also common among Russian Mennonites.

• Aganetha Dyck (born 1937), Canadian artist
• Anthony van Dyck (1599–1641), Flemish artist
• Arnold Dyck (1889-1970), Canadian author
• Cornelius Van Allen Van Dyck (1818–1895), American missionary
• Erika Dyck (born 1975), Canadian historian
• Howard Dyck (born 1942), Canadian conductor
• Jonathan Dyck, Canadian graphic novelist
• Lillian Dyck (born 1945), Canadian senator
• Lionel Dyck (1944–2024), Rhodesian-born mercenary
• Paul Dyck (born 1971), Canadian ice hockey player
• Peter George Dyck (1946–2020), Canadian politician
• Rand Dyck (born 1943), Canadian professor
• Walther von Dyck (1856–1934), German mathematician

• Elsie Dyck, fictional Mennonite writer in Andrew Unger's novel Once Removed
• Harry Dyck, recurring character in The Daily Bonnet
• Noah and Anita Dyck, fictional Mennonite couple in the television show Letterkenny
• A common misspelling of the movie Dick since the movie's box art title and logo on the trailer have the hands of a person pointed out to shape like a "Y".

• Schloss Dyck, a castle in North Rhine-Westphalia, Germany
• Dyck Advisory Group, a private military company based in Velddrif, South Africa

• Dick (surname)
• Dyck language
• Dyke (disambiguation) or Dike, Van Dyke (disambiguation)
• Dueck or Dück (surname)