| Serhiy Ryzhuk | |
| Office: | Governor of Zhytomyr Oblast |
| Term Start: | 11 January 2004 |
| Term End: | 3 February 2005 |
| Predecessor: | Mykola Rudchenko |
| Successor: | Pavlo Zhebrivskyi |
| Term Start1: | 18 March 2010 |
| Term End1: | 2 March 2014 |
| Predecessor1: | Yuriy Zabela |
| Successor1: | Sydir Kizin |
| Office2: | Ministry of Agrarian Policy |
| Term Start2: | 2002 |
| Term End2: | 11 January 2004 |
| Predecessor2: | Ivan Kyrylenko |
| Successor2: | Viktor Slauta |
| Birth Name: | Serhiy Mykolayovych Ryzhuk |
| Birth Date: | 20 January 1950 |
| Birth Place: | Chudniv, Chudniv Raion, Ukrainian SSR |
| Party: | Party of Regions |
| Alma Mater: | Zhytomyr National Agro-Ecological University NAASU Institute of Land Cultivation |
| Native Name Lang: | uk |
Serhiy Mykolayovych Ryzhuk (Ukrainian: Сергій Миколайович Рижук; born 20 January 1950) is a Ukrainian politician, member of the Verkhovna Rada.
In 1973-1991 he worked at leading positions of Communist party and Komsomol in the region.
In 1991-2004 Ryzhuk worked at the Ministry of Agrarian Policy.
In 2004-2005 he also served as a Governor of Zhytomyr Oblast.
In 2006-2010 Ryzhuk was a member of the Verkhovna Rada representing Party of Regions.
In 2010-2014 he again served as a Governor of Zhytomyr Oblast.