| 123rd Regiment, Illinois Volunteer Infantry/Illinois Volunteer Mounted Infantry |
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Illinois state flag |
| Active | 1862–1865 |
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| Disbanded | July 11, 1865 |
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| Country | United States |
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| Allegiance | Union |
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| Branch | |
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| Equipment | Spencer repeating rifle |
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| Engagements | |
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| 1st Division, XIV Corps | |
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| 4th Division, XIV Corps | |
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The 123rd Regiment Illinois Volunteer Infantry, was an infantry and mounted infantry regiment that served in the Union Army during the American Civil War. In 1863 and 1864 it was temporarily known as the 123rd Illinois Volunteer Mounted Infantry Regiment, as part of Wilder's Lightning Brigade.
