Bielecki (; feminine: Bielecka; plural: Bieleccy) is a Polish-language surname. It is related to a number of surnames in other languages.
| Language | Masculine | Feminine | |
|---|---|---|---|
| Bielecki | Bielecka | ||
| Belarusian (Romanization) | Belarusian: Бялецкі (Bialetski, Bialecki) | Belarusian: Бялецкая (Bialetskaya, Bialeckaja) | |
| Lithuanian | Beleckas, Beleckis | Beleckienė (married) Beleckaitė (unmarried) | |
| Romanian/Moldovan | Belețchi | ||
| Russian (Romanization) | Russian: Белецкий (Beletskiy, Beletskii, Beletsky) | Russian: Белецкая (Beletskaya, Beletskaia) | |
| Ukrainian (Romanization) | Ukrainian: Білецький (Bileckyj, Biletskyi, Biletsky, Biletskyy)Ukrainian: Белецький (Beleckyj, Beletskyi, Beletsky, Beletskyy) | Ukrainian: Білецька (Bilecka, Biletska)Ukrainian: Белецька (Belecka, Beletska) |