Pietrosu (meaning "rocky") may refer to several places in Romania:
Pietrosu, a village in Costești Commune, Buzău County Pietrosu, a village in Tătăruși Commune, Iași County Pietrosu, a village in Oniceni Commune, Neamț County
and to a village in Moldova: Pietrosu, Fălești, a commune in Fălești district
and three mountain peaks in Romania: Pietrosu Peak (Rodna), Rodna Mountains, Maramureș County (2303 m) Pietrosu Peak (Călimani), Călimani Mountains, Suceava/Mureș County (2100 m) Pietrosu Peak (Bistrița), Bistrița Mountains, Suceava County (1791 m)
and the following rivers in Romania: Pietrosu, a tributary of the Bârzava in Caraș-Severin County Pietrosu, a tributary of the Cracăul Alb in Neamț County Pietrosu, a tributary of the Dobrovăț in Iași County Pietrosu, a tributary of the Orăștie in Hunedoara County Pietrosu, a tributary of the Păscoaia in Vâlcea County
See also Pietrosul (disambiguation) Pârâul Pietros (disambiguation)