| Guan Siyu | |
| Native Name: | 关思宇 |
| Miss China World 2017 | |
| Birth Date: | 19 May 1994 |
| Birth Place: | Harbin, Heilongjiang, China |
| Education: | Bachelor of Arts |
| Hair Colour: | Black |
| Eye Color: | Black |
| Occupation: | Model |
| Competitions: | Miss China World 2017 (Winner) Miss World 2017 (Top 40) |
Guan Siyu (; born May 19, 1994) is a Chinese model and beauty pageant titleholder who was crowned Miss China World 2017 and was a contestant for Miss World 2017 in China.
She was born in Harbin, Heilongjiang, China. She also has a Bachelor of Arts.
Siyu was crowned Miss China World 2017 by outgoing titleholder Jing Kong, which qualified her to represent her country at Miss World 2017.[1]
She competed at the Miss World 2017 on November 18, 2017, in Sanya, China, and placed Top 40.