| William Tiero | |
| Upright: | 0.9 |
| Full Name: | William Kwabena Tiero |
| Birth Date: | 1980 12, df=yes |
| Birth Place: | Tema, Ghana |
| Height: | 1.74 m |
| Position: | Midfielder |
| Years1: | 2002–2003 |
| Years2: | 2004–2005 |
| Years3: | 2005–2006 |
| Years4: | 2006–2007 |
| Years5: | 2007–2010 |
| Years6: | 2010 |
| Years7: | 2011 |
| Years8: | 2011–2012 |
| Years9: | 2012–2013 |
| Clubs1: | Liberty Professionals |
| Clubs2: | Asante Kotoko |
| Clubs3: | Vitória SC |
| Clubs4: | Naval |
| Clubs5: | Académica Coimbra |
| Clubs6: | CSKA Sofia |
| Clubs7: | Olhanense |
| Clubs8: | Al-Qadisiyah |
| Clubs9: | Gil Vicente |
| Caps2: | 0 |
| Caps3: | 0 |
| Caps4: | 0 |
| Caps5: | 74 |
| Caps6: | 4 |
| Caps7: | 4 |
| Caps8: | 15 |
| Caps9: | 12 |
| Goals2: | 0 |
| Goals3: | 0 |
| Goals4: | 0 |
| Goals5: | 6 |
| Goals6: | 0 |
| Goals7: | 0 |
| Goals8: | 1 |
| Goals9: | 0 |
| Nationalyears1: | 2003–2008 |
| Nationalteam1: | Ghana |
| Nationalcaps1: | 9 |
| Nationalgoals1: | 0 |
William Kwabena Tiero (born 3 December 1980) is a Ghanaian former professional footballer who played as a midfielder.
Tiero was part of the Ghanaian 2004 Olympic football team, which exited in the first round, having finished in third place in group B. Played all the three games against Italy, Paraguay and Japan, scored one goal.