Brighton by-election may refer to several by-elections in Brighton, England:
1st–16th Parliaments of the UK (1801–1857) 1842 Brighton by-election, won by Lord Alfred Hervey, standing as a Conservative 1853 Brighton by-election, won by Lord Alfred Hervey, standing as a Peelite
17th–26th Parliaments (1857–1900) 1860 Brighton by-election, won by James White, Liberal 1864 Brighton by-election, won by Henry Moor, Conservative 1884 Brighton by-election, won by William Thackeray Marriott, standing as a Conservative 1885 Brighton by-election, won by William Thackeray Marriott August 1886 Brighton by-election, won by William Thackeray Marriott November 1886 Brighton by-election, won by William Tindal Robertson, Conservative 1889 Brighton by-election, won by Gerald Walter Erskine Loder, Conservative 1893 Brighton by-election, won by Bruce Canning Vernon-Wentworth, Conservative
27th–35th Parliaments (1900–1931) 1905 Brighton by-election, won by Ernest Villiers, Liberal 1911 Brighton by-election, won by John Gordon, Conservative 1914 Brighton by-election, won by Charles Thomas-Stanford, Conservative
36th–38th Parliaments (1931–1950) 1940 Brighton by-election, won by Lord Erskine, Conservative 1941 Brighton by-election, won by Anthony Marlowe, Conservative 1944 Brighton by-election, won by William Teeling, Conservative
39th–47th Parliaments (1950–1979) 1969 Brighton Pavilion by-election, won by Julian Amery, Conservative