Jonas Gaines

{{Short description|Negro League Baseball player (1914–1998)}}

{{Infobox baseball biography

| name = Jonas Gaines

| image = Jonas Gaines.jpg

| position = Pitcher

| birth_date = {{Birth date|1914|1|9|mf=y}}

| birth_place = New Roads, Louisiana, U.S.

| death_date = {{death date and age|1998|8|6|1914|1|9|mf=y}}

| death_place = Baker, Louisiana, U.S.

| bats = Right

| throws = Left

| debutleague = Negro league baseball

| debutdate =

| debutyear = 1937

| debutteam = Washington Elite Giants

| finaldate =

| finalyear = 1953

| finalteam = Hankyu Braves

| statyear =

|statleague = NPB

| stat1label = Win–loss record

| stat1value = 14–9

| stat2label = Earned run average

| stat2value = 2.53

| stat3label = Strikeouts

| stat3value = 142

| teams =

• Washington Elite Giants ({{baseball year|1937}})
• Newark Eagles ({{baseball year|1937}})
• Baltimore Elite Giants ({{baseball year|1938}}–{{baseball year|1939}}, {{baseball year|1941}}–{{baseball year|1942}}, {{baseball year|1944}}–{{baseball year|1948}})
• Hankyu Braves ({{npby|1953}})

| highlights =

}}

Jonas Donald Gaines (January 9, 1914 – August 6, 1998), nicknamed "Lefty", was an American baseball pitcher in the Negro leagues. He played professionally from 1937 to 1953 with several teams.

A native of New Roads, Louisiana, Gaines served in the US Army during World War II.{{cite web|author= |url=https://www.baseballinwartime.com/negro.htm |title=Negro Leaguers Who Served With The Armed Forces in WWII |publisher=baseballinwartime.com |date= |accessdate=October 7, 2020}} He pitched in three East-West All-Star Games; 1942, 1946, and 1950. Gaines also pitched in the Cuban League and the Pacific League.{{Cite book |last=Riley |first=James A. |

title=The Biographical Encyclopedia of the Negro Baseball Leagues |place=New York |publisher=Carroll & Graf |year=1994 |isbn=0-7867-0959-6 |postscript= }} He died in Baker, Louisiana in 1998 at age 84.