"Blighty" is a British English slang term for Great Britain, or often specifically England. Though it was used throughout the 1800s in the Indian subcontinent to mean an English or British visitor, it was first used during the Boer War in the specific meaning of homeland for the English or the British. From World War I and afterward, that use of the term became widespread.

The word ultimately derives from the Persian word viletī, (from a regional Hindustani language with the use of b replacing v) meaning 'foreign', which more specifically came to mean 'European', and 'British; English' during the time of the British Raj. The Bengali word is a loan of Indian Persian vilāyatī (ولایاتی), from vilāyat (ولایت) meaning 'Iran' and later 'Europe' or 'Britain', ultimately from Arabic wilāyah ولاية‎ meaning 'state, province'.

The term subsequently gained an ironic connotation in its closeness to the English word blight, which means "epidemic."

Blighty is commonly used as a term of endearment by the expatriate British community or those on holiday to refer to home. In Hobson-Jobson, an 1886 historical dictionary of Anglo-Indian words, Henry Yule and Arthur Coke Burnell explained that the word came to be used in British India for several things the British had brought into the country, such as the tomato and soda water.

During the First World War, "Dear Old Blighty" was a common sentimental reference, suggesting a longing for home by soldiers in the trenches. The term was particularly used by World War I poets such as Wilfred Owen and Siegfried Sassoon. During that war, a "Blighty wound" – a wound serious enough to require recuperation away from the trenches but not serious enough to kill or maim the victim – was hoped for by many, and sometimes self-inflicted.

An early example of the usage of a derivative of the Arabic wilāyah being used to refer to Britain is after diplomat I'tisam-ud-Din returned from Britain back to the Mughal Empire. The locals nicknamed him Bilayet Munshi due to him being the first South Asian (c. 1765) to travel to what was known as the Bilayet.

Blighty, a humorous weekly magazine, was issued free to British troops during the First World War. It contained short stories, poems, cartoons, paintings, and drawings, with contributions from men on active service. It was distributed by the War Office, the Admiralty and the Red Cross, and subsidised through donations and sales to the general public. The magazine was revived in 1939 and continued until 1958.

In his First World War autobiography Good-Bye to All That (1929), the writer Robert Graves attributes the term Blitey to the Hindustani word for "home." He writes: "The men are pessimistic but cheerful. They all talk about getting a 'cushy' one to send them back to 'Blitey'."