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