This is an incomplete list of Acts of the Parliament of the United Kingdom for the year 1803. Note that the first parliament of the United Kingdom was held in 1801; parliaments between 1707 and 1800 were either parliaments of Great Britain or of Ireland). For Acts passed up until 1707 see List of Acts of the Parliament of England and List of Acts of the Parliament of Scotland. For Acts passed from 1707 to 1800 see List of Acts of the Parliament of Great Britain. See also the List of Acts of the Parliament of Ireland.
For Acts of the devolved parliaments and assemblies in the United Kingdom, see the List of Acts of the Scottish Parliament, the List of Acts of the Northern Ireland Assembly, and the List of Acts and Measures of Senedd Cymru; see also the List of Acts of the Parliament of Northern Ireland.
The number shown after each Act's title is its chapter number. Acts passed before 1963 are cited using this number, preceded by the year(s) of the reign during which the relevant parliamentary session was held; thus the Union with Ireland Act 1800 is cited as "39 & 40 Geo. 3 c. 67", meaning the 67th Act passed during the session that started in the 39th year of the reign of George III and which finished in the 40th year of that reign. Note that the modern convention is to use Arabic numerals in citations (thus "41 Geo. 3" rather than "41 Geo. III"). Acts of the last session of the Parliament of Great Britain and the first session of the Parliament of the United Kingdom are both cited as "41 Geo. 3". Acts passed from 1963 onwards are simply cited by calendar year and chapter number.
All modern Acts have a short title, e.g. "the Local Government Act 2003". Some earlier Acts also have a short title given to them by later Acts, such as by the Short Titles Act 1896.
43 Geo. 3
Continuing the first session of the 2nd Parliament of the United Kingdom, which met from 22 November 1803 until 31 July 1804.
Public general acts
| { { |Militia Act (No. 1) 1803|public|19|24-03-1803|repealed=y|archived=n|An act to authorize the training and exercising the Militia of Great Britain for twenty-eight Days.|note4= }}
| { { |Mutiny Act 1803|public|20|24-03-1803|repealed=y|archived=n|An act for punishing Mutiny and Desertion; and for the better Payment of the Army and their Quarters.|note4= }}
| { { |Stamps Act 1803|public|21|24-03-1803|repealed=y|archived=n|An act for granting to his Majesty several Duties therein mentioned, to be levied by the Commissioners for managing the Stamp Duties in Ireland.|note4= }}
| { { |Hat Duties Act 1803|public|22|24-03-1803|repealed=y|archived=n|An act for granting to his Majesty certain Duties on Licences to Persons selling Hats, and on Hats sold by Retail, in Ireland.|note4= }}
| { { |Duties on Game Certificates Act 1803|public|23|24-03-1803|repealed=y|archived=n|An act for granting to his Majesty certain Duties upon Certificates with respect to the killing of Game in Ireland.|note4= }}
| { { |Duties Continuance Act 1803|public|24|24-03-1803|repealed=y|archived=n|An act for continuing, until the twenty-fifth Day of March One thousand eight hundred and four, several Acts for granting and continuing Duties to his Majesty in Ireland.|note4= }}
| { { |Parliamentary Elections (Ireland) Act 1803|public|25|24-03-1803|repealed=y|archived=n|An act for better securing the Freedom of Elections of Members to serve in Parliament for any Place in Ireland, by disabling certain Officers employed in the Collection or Management of his Majesty's Revenues in Ireland from giving their Votes at such Elections.|note4= }}
| { { |Annuity to Prince of Wales, etc. Act 1803|public|26|24-03-1803|repealed=y|archived=n|An act for enabling his Majesty to settle an Annuity on his Royal Highness the Prince of Wales, to continue until the fifth Day of July One thousand eight hundred and six; and for repealing so much of an Act made in the thirty-fifth Year of the Reign of his Majesty, as directs the annual Payment of thirteen thousand rounds out of the Revenues of the Dutchy of Cornwall to the Commissioners appointed by the said Act.|note4= }}
| { { |Marine Mutiny Act 1803|public|27|24-03-1803|repealed=y|archived=n|An act for the Regulation of his Majesty's Royal Marine Forces while on Shore.|note4= }}
| { { |Postage Act 1803|public|28|25-03-1803|repealed=y|archived=n|An act for granting to his Majesty certain Rates and Duties upon Letters and Packets lent by the Post within Ireland.|note4= }}