35th Indiana Infantry Regiment

{{Infobox military unit

|unit_name=35th Regiment Indiana Infantry

| image=35thMonument2006.jpg

| image_size = 250

|caption=Monument commemorating the 35th Indiana

|country=United States of America

|allegiance=Union

|type=Regiment

|branch=Union Army

|dates= 1861 - 1865

|specialization= Infantry

|command_structure= Army of the Ohio, 1862; Army of the Cumberland, 1863-1865 XIV Army Corps,
XXI Army Corps,
IV Army Corps

|size=

|current_commander=

|garrison=

|ceremonial_chief=

|nickname= 1st Irish Regiment

|motto=Be just and fear not. (Vaness, Indianapolis Journal December 1861)

|colors=Emerald green (with scarlet and gold letters), large eagle with shamrock and harp suspended on a green ribbon from its beak (Vaness, Indianapolis Journal December 1861)

| commander1 =Father Peter Paul Cooney

| commander1_label =Chaplain

|mascot=

|battles=Battle of Stones River
Tullahoma Campaign
Battle of Hoover's Gap
Battle of Chickamauga
First Battle of Chattanooga
Third Battle of Chattanooga
Battle of Ringgold Gap
Atlanta Campaign
Battle of Rocky Face Ridge
Battle of Resaca
Battle of New Hope Church
Battle of Dallas
Battle of Marietta
Battle of Kennesaw Mountain
Battle of Atlanta
Battle of Jonesboro
Franklin-Nashville Campaign
Battle of Columbia
Battle of Franklin
Battle of Nashville

|notable_commanders= Colonel John C. Walker
Colonel Bernard F. Mullen
Colonel Augustus Gabriel de Vivier Tassin
Major John P. Dufficy

|anniversaries=December 11, 1861 (mustering in)
October 23, 1865 (discharge)

}}

The 35th Indiana Infantry Regiment, also known as 1st Irish Regiment as it was mainly made up of Irish-Americans, was a unit of the Union Army during the American Civil War.