| Ulrich I, Duke of Mecklenburg-Stargard | |
| Noble Family: | House of Mecklenburg |
| Father: | John I, Duke of Mecklenburg-Stargard |
| Mother: | Agnes of Lindow-Ruppin |
| Spouse: | Margaret of Pomerania-Stettin |
| Birth Date: | before 1382 |
| Death Place: | Strelitz |
| Burial Place: | Blankensee |
Ulrich I, Duke of Mecklenburg-Stargard (before 1382 - 8 April 1417) was Duke of Mecklenburg-Stargard from 1392 or 1393 until his death. He was also Lord of Neubrandenburg, Stargard, Strelitz and Wesenberg.
He was the third child of Duke John I, from his marriage Agnes of Lindow-Ruppin.
Ulrich I was probably born before 1382. After his father's death in 1392 or 1393, he ruled jointly with his brothers John II and Albert I (d. 1397). In 1408, Ulrich and John divided the country. Ulrich received the Lordships of Neubrandenburg, Stargard, Strelitz and Wesenberg. He chose Neubrandenburg as his residence.
On 19 March 1417, he wrote his will at his Castle in Strelitz. He died there three weeks later, on 8 April 1417. He was buried in the Wanzka convent in Blankensee, where his daughter Anna was abbess.
Ulrich I married Margaret, the daughter of Duke Swantibor III of Pomerania-Stettin. They had the following children: