Purnomo is both an Indonesian surname and an Indonesian given name. Notable people with the surname include:
Adrianus Purnomo (born 2000), Indonesian football player Mohamed Purnomo (1961–2019), Indonesian sprinter Saptoyoga Purnomo (born 1998), Indonesian Paralympic sprinter
Given name Purnomo Kasidi (1933–1996), Indonesian politician Purnomo Yusgiantoro (born 1951), Indonesian politician