| Ur-Baba Sumerian: {{cuneiform| | |
| Ruler of Lagash | |
| Reign: | c. 2100 BC |
| Predecessor: | Kaku or Kakug |
| Successor: | Gudea |
| Dynasty: | Ruler of Lagash |
Ur-Baba or Ur-Bau (Sumerian: {{cuneiform| or , servant of the goddess Bau) was ensi of Lagash from 2093 BC – 2080 BC (short chronology) or 2157 BC – 2144 BC (middle chronology), roughly contemporaneous with the last king of Akkad, Shu-turul. In one of his inscriptions, he refers to himself as a child of the god Ninagal (Sumerian: {{cuneiform|).
According to inscriptions of Ur-Baba, during his reign Lagash enjoyed prosperity and independence from the Akkadians. His daughter Ninalla married Gudea, who succeeded him as ensi.[1]