The Rochester by-election, 1903 was a parliamentary by-election held in England in September 1903 for the House of Commons constituency of Rochester in Kent.
The Liberals were disappointed that the election was called so soon after the vacancy occurred, because they believed that a longer campaign would help their prospects. Both candidates had issued the election address by 9 September, along with a lot of supporting literature. The two parties hoped to canvass all the borough's electors, but acknowledged that the shortness of the campaign made this target unlikely. The Unionists were reported by The Times newspaper to have a "near-perfect" organisation in Rochester. The main issue in the campaign was tariff reform, over which the Liberal Unionist minister Joseph Chamberlain had recently resigned from the cabinet to campaign for Imperial Preference. The Liberals also focused on the conduct of the Second Boer War. In the first full week of the campaign, the Unionists decided not to hold a large public meeting, but rather to hold five smaller meetings in different parts of the borough. Speakers were to include Sir William Hart Dyke MP and Horatio Davies MP. The Liberals held the biggest meeting, at the Corn Exchange, but otherwise the meetings organised by the Unionists were better attended. A major theme in the campaign was the question of free trade; Edmund Robertson MP spoke at a Liberal meeting to say that the issue was simply one of taxing food: would the tariffs on food be renewed? Johnston sent a "personal note" to Unionist supporters condemning the Unionist government's handling of the Boer War, and accusing them of deliberately throwing away the lives of British soldiers. He called on any Unionists who saw themselves as patriots to abstain rather than elect a supporter of such a government. Extensive canvassing took place on Saturday 19 September, after which both parties reported that the outcome would likely depend on the Labour vote. Both the Tariff Reform League and the Free Trade Association distributed large numbers of leaflets and cartoons, and the Licensed Victuallers Association was actively organising in support of the Unionists. The costs incurred by the two candidates were reported in The Times in November 1903: Tuff's campaign had spent £559 18s 5d, and Johnston's campaign had spent £636 4s. 4d.