Caló (English: /kəˈloʊ/; Spanish: [kaˈlo]; Catalan: [kəˈlo]; Galician: [kaˈlɔ]; Portuguese: [kɐˈlɔ]; French: [ka.lo]) is a mixed language spoken by the gitanos of Spain and the ciganos of Portugal. In Romani linguistics, it is considered a Para-Romani language based on Romance grammar, with an adstratum of Romani lexical items, through language shift by the Romani community. It is said^{[by whom?]} to be used as an argot, or a secret language, for discreet communication amongst Iberian Romani.^{[citation needed]} Catalan, Galician, Portuguese, and Spanish caló are closely related varieties that share a common root.

Spanish caló, or Spanish Romani, was originally known as zincaló. Portuguese caló, or Portuguese Romani, also goes by the term lusitano-romani; it used to be referred to as calão, but this word has since acquired the general sense of jargon or slang, often with a negative undertone (cf. baixo calão, 'obscene language', lit. low-level calão).

The language is also spoken in Brazil, France, Venezuela, Portugal and Colombia.

Some Caló expressions have been borrowed into modern Spanish jerga (slang), such as camelar (to seduce), currar (to work) and dar lache (to cringe in shame or embarrassment).

Calé is the endonym of the Romani people in Iberia, and caló means 'the language spoken by the calé'. However, the calé are commonly known in Portuguese- and Spanish-speaking countries by the exonyms ciganos and gitanos.

In caló and other varieties of Romani, kalo means 'black' or 'absorbing all light', hence closely resembling words for 'black' and/or 'dark' in Indo-Aryan languages (e.g. Sanskrit काल kāla 'black', 'of a dark colour'). Hence caló and calé may have originated as ancient exonyms.

Caló has six vowels:

It has the following consonant inventory: