| Unit Name: | 149th Indiana Infantry Regiment |
| Dates: | March 1 – September 27, 1865 |
| Country: |  United States |
| Allegiance: | Union |
| Branch: | Infantry |
| Size: | Regiment[1] |
| Garrison: | Decatur, Alabama |
| Battles: | American Civil War |
| Disbanded: | September 27, 1865 |
| Commander1: | William H. Fairbanks[2] |
| Commander1 Label: | Colonel |
| Commander2: | William D. Mull[3] |
| Commander2 Label: | Lt. Colonel |
| Commander3: | Thomas B. Reeder[4] |
| Commander3 Label: | Major |
The 149th Indiana Infantry Regiment was an infantry regiment from Indiana that served in the Union Army between March 1 and September 27, 1865, during the American Civil War.
The regiment was recruited from the 7th district, and was organized at Indianapolis, Indiana, with a strength of 1,041 men[5] and mustered in on March 1, 1865.[6] [7] It left Indiana for Nashville, Tennessee on March 3. It was then ordered to Decatur, Alabama for guard and garrison duty until late September. Whilst at Decatur, the regiment received the surrender of Generals Roddey and Polk.[8] The regiment was mustered out at Nashville, on September 27, 1865.[9] [7] During its service the regiment incurred thirty-eight fatalities, and another twenty-seven men deserted.[10]