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Romanism is a derogatory term for Roman Catholicism used when anti-Catholicism was more common in the United States.
The term was frequently used in late-nineteenth and early-twentieth century Republican invectives against the Democrats, as part of the slogan "Rum, Romanism, and Rebellion" (referencing the Democratic party's constituency of Southerners and anti-Temperance, frequently Catholic, working-class immigrants). The term and slogan gained particular prominence in the 1884 presidential campaign and again in 1928, in which the Democratic candidate was the outspokenly anti-Prohibition Catholic Governor of New York Al Smith.
The term was also used by Democratic Unionist Party founder Ian Paisley in anti-Catholic speeches 
- ^ Dowling, John (1845). The History of Romanism: from the Earliest Corruptions of Christianity to the Present Time (fourth ed.). E. Walker. pp. –2.
- ^ "Rev Ian Paisley 1966 – YouTube". YouTube.
- Is Romanism Christianity? (1917) by T.W. Medhurst (from The Fundamentals)
- Romanism and the Reformation (1881) by Henry Grattan Guinness
- The Bible and Romanism – the window-dressing continues (2000), by Arthur Noble