Trojanowski is a Polish masculine surname, its feminine counterpart is Trojanowska. Its Russian and Ukrainian versions (Russian: Трояновский, Ukrainian: Трояновський) are transliterated as Troyanovsky, Troyanovski, Troyanovskyi (masculine) or Troyanovskaya (feminine). It may refer to:
Daniel Trojanowski (born 1982), Polish rower
Eduard Troyanovsky (born 1980), Russian boxer
Izabela Trojanowska (born 1955), Polish singer and film actress
Izabella Trojanowska (1929–1995), Polish journalist
John Q. Trojanowski (born 1946), American scientist
Mieczyslaw Rys-Trojanowski (1881–1945), Polish general
Oleg Troyanovsky (1919–2003), ambassador of the Soviet Union to Japan and China
Tadeusz Trojanowski (1933–1997), Polish wrestler
Wincenty Trojanowski (1859–1928), Polish painter
Yevhen Troyanovskyi (born 1993), Ukrainian football player
