Jonker (Dutch pronunciation: [ˈjɔŋkər]) is a Dutch surname. It is also a variation of the title jonkheer. The name can be occupational of origin, indicating an ancestor who was or worked for a jonkheer, or toponymical, e.g. referring to a house named De Jonker. People with the surname include:

• Andries Jonker (born 1962), Dutch football player and manager
• Catholijn Jonker (born 1967), Dutch computer scientist
• Charles Jonker (1933–1991), South African racing cyclist
• Christiaan Jonker (born 1986), South African cricketer
• Henk Jonker (1912–2002), Dutch photographer
• Ingrid Jonker (1933-1965), South African poet
  • Ingrid Jonker Prize, literary prize for the best Afrikaans or English poetry debut work
  • Ingrid Jonker (film), Dutch English-language film about her life
• Jacobus Jonker (fl. 1996), South African paralympic athlete
• Johannes Jonker (born 1994), South African rugby player
• JW Jonker (born 1987), South African rugby player
• Kees Jonker (1909–1987), Dutch competitive sailor
• Kelly Jonker (born 1990), Dutch field hockey player
• Kobus Jonker (fl. 2000), South African paralympic athlete
• Kobus "Donker" Jonker, former head of the South African Police Service Occult Related Crimes Unit and a figure in the Satanic panic (South Africa)
• Louis Jonker (1962), South African biblical scholar and linguist
• Margo Jonker (born 1954), American softball coach
• Marius Jonker (born 1968), South African rugby referee
• Patrick Jonker (born 1969), Dutch-born Australian racing cyclist
  • Patrick Jonker Veloway, Australian bikeway named for him
• Robert James Jonker (born 1960), American (Michigan) judge
• Patrick Jonker (born 1944), Australian racing cyclist
• Roos Jonker (born 1980), Dutch jazz singer
• Sjouke Jonker (1924–2007), Dutch journalist and politician, MEP 1979–84

Jonkers

• Jan Jonkers (born 1955), Dutch racing cyclist
• Jan Engbertus Jonkers (1890–1971), Dutch jurist and university dean
• Marayke Jonkers (born 1981), Australian swimmer and paratriathlete
• Tim Jonkers (born 1980), Dutch-born Irish rugby player

Adopted as a given name

• Jonker Afrikaner (c. 1785–1861), Namibian Orlam leader
• Jan Jonker Afrikaner (c. 1820–1861), Namibian Orlam leader, son of Jonker
  • Jan Jonker Afrikaner High School, secondary school in Windhoek, Namibia