Cheng Kai-wen

{{short description|Taiwanese baseball player (born 1988)}}

{{Infobox baseball biography

| name = Cheng Kai-wen

| image = Cheng Kai-Wen.jpg

| image_size = 250

| caption = Kai-Wen with the Hanshin Tigers

| team = CTBC Brothers

| number = 19

| position = Pitcher

| birth_date = {{birth date and age|1988|7|26}}

| birth_place = Tainan, Taiwan

| bats = Right

| throws = Right

| debutleague = NPB

| debutdate = April 26

| debutyear = 2009

| debutteam = Hanshin Tigers

| debut2league = CPBL

| debut2date = March 25

| debut2year = 2014

| debut2team = Chinatrust Brothers

| statleague = NPB

| statyear = 2013 season

| stat1label = Win–loss record

| stat1value = 2–3

| stat2label = Earned run average

| stat2value = 5.16

| stat3label = Strikeouts

| stat3value = 40

| stat2league = CPBL

| stat2year = April 22, 2025

| stat21label = Win–loss record

| stat21value = 80–54

| stat22label = Earned run average

| stat22value = 3.72

| stat23label = Strikeouts

| stat23value = 750

| teams =

• Hanshin Tigers ({{npby|2009}}–{{npby|2012}})
• Yokohama DeNA BayStars ({{npby|2013}})
• Chinatrust Brothers / CTBC Brothers ({{by|2014}}–present)

| awards =

• 3x Taiwan Series champion ({{by|2021}}, {{by|2022}}, {{by|2024}})

}}

Cheng Kai-wen ({{zh|c=鄭凱文}}; using "{{nihongo|Cheng|ジェン||}}" as his registration until 2010, born July 26, 1988) is a Taiwanese professional baseball pitcher for the CTBC Brothers of the Chinese Professional Baseball League (CPBL). He has previously played in Nippon Professional Baseball (NPB) for the Hanshin Tigers and Yokohama DeNA BayStars.