There have been many statutes known as Militia Act.
- The King's Sole Right over the Militia Act 1661, England
- Militia Act 1662, England, defining lord-lieutenants powers to raise militia
- Militia Act 1757, creating a militia to defend Britain during the Seven Years' War, leading to the creation of The Poker Club in Scotland
- Militia Act 1786, an Act of the Parliament of Great Britain
- Militia Acts of 1792 (Uniform Militia Act), two acts passed by the United States Federal government
- Militia Act of 1793
- Militia Act 1797, to create a uniform Scottish militia
- Militia Act of 1808, United States
- Militia Act of 1855, Canada
- Militia Act of 1862, United States
- Militia Act of 1903 (Dick Act), United States
- Militia Act 1745, Kingdom of Great Britain
- Militia Act 1802, United Kingdom
- Militia Act 1803 (43 Geo. 3. c. 50) Act of the Parliament of the United Kingdom
- Militia Act of 1845, to create the Nelson Battalion of Militia in New Zealand
- Militia Act 1882, United Kingdom, amended by the Reserve Forces and Militia Act 1898