二郎, meaning "second, son", may refer to:
Erlang (disambiguation), Chinese transliterated title Erlang, Susong County Erlang, Taihe County Erlang, Hechuan District Jiro (disambiguation), Japanese transliterated title Jiro (given name) Niro (disambiguation), Japanese transliterated title Nirō, a station in Hyōgo Prefecture, Japan
See also
太郎 (disambiguation)