Al Mattern

{{short description|American baseball player (1883-1958)}}

{{Use mdy dates|date=June 2024}}

{{Infobox baseball biography

|name=Al Mattern

|position=Pitcher

|image=Al Mattern.jpg

|bats=Left

|throws=Left

|birth_date={{birth date|1883|6|16}}

|birth_place=West Rush, New York, U.S.

|death_date={{death date and age|1958|11|6|1883|6|16}}

|death_place=West Rush, New York, U.S.

|debutleague = MLB

|debutdate=September 16

|debutyear=1908

|debutteam=Boston Doves

|finalleague = MLB

|finaldate=April 19

|finalyear=1912

|finalteam=Boston Braves

|statleague = MLB

|stat1label=Win–loss record

|stat1value=36–58

|stat2label=Earned run average

|stat2value=3.37

|stat3label=Strikeouts

|stat3value=254

|teams=

• Boston Doves/Rustlers/Braves (1908–1912)

}}

Alonzo Albert Mattern (June 16, 1883 – November 6, 1958) was a professional baseball player who pitched in the Major Leagues from {{Baseball year|1908}} to {{Baseball year|1912}}. He played for the Boston Braves.