Tomoya Yagi

{{short description|Japanese baseball player}}

{{Infobox NPB player

| name = Tomoya Yagi

| image =

| image_size = 250px

| position = Pitcher

| team =

| number =

| birth_date = {{birth date and age|1983|11|7}}

| birth_place = Hodogaya-ku, Yokohama, Kanagawa, Japan

| bats = Left

| throws = Left

| debutleague = NPB

| debutdate =

| debutyear = 2006

| debutteam = Hokkaido Nippon-Ham Fighters

| statyear = 2016

| stat1label = Win–loss record

| stat1value = 39-34

| stat2label = ERA

| stat2value = 3.69

| stat3label = Strikeouts

| stat3value = 361

| teams =

• Hokkaido Nippon-Ham Fighters ({{npby|2006}}–{{npby|2012}})
• Orix Buffaloes ({{npby|2013}}–{{npby|2014}})
• Chunichi Dragons ({{npby|2015}}–{{npby|2017}})

|awards=

• {{Baseball year|2006}} Central League Rookie of the Year
• 1× NPB All-Star (2006)

| update = 6 October 2016

}}

Tomoya Yagi (八木 智哉, born November 7, 1983, in Yokohama) is a Japanese former professional baseball pitcher in Japan's Nippon Professional Baseball. He won the Pacific League Rookie of the Year Award in 2006. He played for the Hokkaido Nippon-Ham Fighters, Orix Buffaloes, and Chunichi Dragons from 2006 to 2017.