Koca (a Turkish word meaning "great" or "large") may refer to:
People
Epithet Koca Barbul Ban (died 1565), Wallachian rebel Koca Ragıp Pasha (1698–1763), Ottoman statesman Koča Andjelković (1755–1789), Serbian rebel Koca Hüsrev Mehmed Pasha (1769–1855), Ottoman admiral Koca Mustafa Reşid Pasha (1800–1858), Ottoman statesman Koca Yusuf (1857–1898), Turkish professional wrestler Koca Mi'mâr Sinân Âğâ (1488/1490-1588), Ottoman architect and civil engineer
Surname Atilla Koca (born 1980), Turkish footballer Fahrettin Koca (born 1965), Turkish physician and politician Gülcan Koca (born 1990), Turkish-Australian female footballer
Places Koca Mustafa Pasha Mosque