Billy Riley
- Given Name
- William James
- Nickname(s)
- Pigtail Billy
- Born
- 1855 — Cincinnati, OH, USA
- Died
- 11/9/1887 — Cincinnati, OH, USA
- Weight
- 160 lbs
- Height
- 5' 10"
- Throws
- R
- Bats
- R
- Team(s)
- Keokuk Westerns (1875)Cleveland Blues (1879)
- Debut
- 1875-05-04
- Final Game
- 1879-09-30