| Konrad III the Old | |
| Duke of Oleśnica, Koźle | |
| Noble Family: | Silesian Piasts of Oleśnica |
| Father: | Konrad II the Gray |
| Mother: | Agnes of Cieszyn |
| Spouse: | Judith/Jutta/Guta |
| Issue: | Konrad IV the Elder Konrad V Kantner Konrad VI the Dean Konrad VII the White Konrad VIII the Younger Euphemia Hedwig |
| Birth Date: | c. 1359 |
| Death Date: | 28 December 1412 |
Konrad III the Old (Polish: '''Konrad III Stary''') (– 28 December 1412) was a Duke of Oleśnica, Koźle, half of Bytom and half of Ścinawa since 1377 (until 1403 with his father as co-ruler).
He was the only son of Konrad II the Gray, Duke of Oleśnica, by his wife Agnes, daughter of Casimir I, Duke of Cieszyn.
In 1377 his father named him co-ruler of all his lands, as his only son and heir. Konrad III began his reign alone only in 1403, after his father's death. Little is known about his reign.
By 1380 he married with Judith (also named Jutta or Guta) (d. 26 June 1416), whose origins are unknown. They had seven children:
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