Highway H03 is a national highway in Ukraine connecting the cities of Zhytomyr and Chernivtsi.
The road has a total length of 350 km and passes through the territories of Zhytomyr, Khmelnytskyi and Chernivtsi regions. Its notable intermediary points are Chudniv, Liubar, Starokostiantyniv, Khmelnytskyi (junction with M30), Yarmolyntsi, Dunaivtsi, Kamianets-Podilskyi, Khotyn and Novoselytsia.