Naoya Masuda

{{short description|Japanese baseball player}}

{{Infobox NPB player

| name = Naoya Masuda

| image = 2012marines masuda.jpg

| image_size = 250px

| caption = Masuda with the Chiba Lotte Marines

| position = Pitcher

| team = Chiba Lotte Marines

| number = 52

| birth_date = {{birth date and age|1989|10|25}}

| birth_place = Tokyo Japan

| bats = Right

| throws = Right

| debutleague = NPB

| debutdate = March 30

| debutyear = 2012

| debutteam = Chiba Lotte Marines

| finalleague =

| finaldate =

| finalyear =

| finalteam =

| statyear = 2024 season

| statleague = NPB

| stat1label = Win–loss record

| stat1value = 33-52

| stat2label = ERA

| stat2value = 2.92

| stat3label = Strikeouts

| stat3value = 661

| stat4label = Saves

| stat4value = 243

| stat5label = Holds

| stat5value = 172

| teams =

• Chiba Lotte Marines ({{npby|2012}}–present)

| highlights =

• Pacific League Rookie of the Year ({{npby|2012}})
• 2× Pacific League Saves leader ({{npby|2013}}, {{npby|2021}})
• 5× NPB All-Star ({{npby|2012}}, {{npby|2013}}, {{npby|2016}}, {{npby|2021}}, {{npby|2022}})

}}

Naoya Masuda (益田 直也, born October 25, 1989, in Kinokawa, Wakayama) is a Japanese professional baseball pitcher for the Chiba Lotte Marines of Japan's Nippon Professional Baseball.