King Si of Zhou, ch: 周思王, pinyin: zhōu sī wáng, wg: King Si of Chou, was the twenty-ninth sovereign of the Chinese Zhou Dynasty and the seventeenth of Eastern Zhou Dynasty.
| family name | Ji (姬 jī) in Chinese |
| given name | Shu (叔 shú) in Chinese |
| era name | none |
| father | King Zhending of Zhou |
| mother | unknown |
| wife | unknown |
| children | unknown |
| duration of reign | 441 BC |
| tomb | unknown |
| temple name | unknown |
| courtesy name | unknown |
| posthumous name | 思 (pinyin sī) literary meaning: "nostalgic" |
| Preceded by: King Ai of Zhou |
Zhou Dynasty | Succeeded by: King Kao of Zhou |