| Lee Si-woo | |
| Nationality: | South Korean |
| Birth Date: | 7 April 1994 |
| Birth Place: | Siheung, Gyeonggi Province, South Korea |
| Height: | 1880NaN0 |
| Weight: | 800NaN0 |
| Spike: | 3000NaN0 |
| Block: | 2900NaN0 |
| College: | Sungkyunkwan University |
| Position: | Wing spiker |
| Currentclub: | Hyundai Capital Skywalkers |
| Currentnumber: | 15 |
| Years: | 2016– |
| Teams: | Hyundai Capital Skywalkers |
| Nationalyears: | 2017– |
| Nationalteam: | South Korea |
| Updated: | 29 December 2017 |
Lee Si-woo (; born 7 April 1994) is a South Korean male volleyball player. He is part of the South Korea men's national volleyball team. On club level he currently plays for the Cheonan Hyundai Capital Skywalkers.
In the 2016 V-League Draft, Lee was selected sixth overall by the Hyundai Capital Skywalkers.
In the 2016–17 season, Lee won his first championship, helping the Skywalkers clinch their third V-League title. Playing as primarily a serving specialist, he served 12 aces while adding 13 kills and 10 digs.
In May 2017 Lee was first selected for the South Korean senior national team to compete at the 2017 FIVB World League. He appeared in all nine games and tallied three aces as a serving specialist.
After finishing the World League in 18th place, he also took part in the 2017 Asian Championship, where South Korea won the bronze medal.