Spanish is the official language of Nicaragua. Nicaraguan Spanish (Spanish: español nicaragüense) is geographically defined as the form of Spanish spoken in Nicaragua. Affectionately, Nicaraguan Spanish is often called Nicañol.

The Spanish dialect in Nicaragua is heavily influenced by Nahuatl and Nawat in its vocabulary and substrate. The Nawat language was spoken by the Nicarao people who inhabit the western half of the country. Despite its extinction in Nicaragua, words of Nahuatl and Nawat origin can be seen and heard in daily Nicaraguan speech and literature.

Nicaragua has the highest frequency, among Central American countries, of the use of voseo—use of the pronoun vos and its verb forms for the familiar second-person singular ("you"), in place of the tú of Standard Spanish. In this regard it is similar to the usage of Argentina and Uruguay in the Río de la Plata region of South America. Vos is used frequently in colloquial and familiar settings, but Nicaraguans also understand tuteo. The use of "vos" can be heard in television programs and can be seen in written form in publications.

In the North Caribbean Coast Autonomous Region and the South Caribbean Coast Autonomous Region, language and pronunciation is strongly influenced by Indigenous and creole languages such as Miskito, Rama, Sumo, Miskito Coastal Creole, Jamaican Patois, Garifuna and Rama Cay Creole but Spanish has become the main language spoken.

The Nicaraguan accent, like most New World Spanish, dates back to the 16th century in Andalusia. It shares later developments of Andalusian Spanish with that of Cuba, the Dominican Republic and the Caribbean/coastal regions of Venezuela, Colombia, Panama, and Puerto Rico. Nicaragua's relative isolation from Spain, however, and, to an extent, from other nations, fostered the development of the Nicaraguan accent, which did not change in the same ways that the Andalusian, Canarian, or other Spanish-American accents did.

Most Central American Dialects have their origins in Guatemala because most dialects grew in Captaincy General of Guatemala.

During its history, Nicaraguan Spanish has acquired many indigenous influences and several distinguishing characteristics. Until the 19th century, a hybrid form of Nahuat-Spanish was the common language of Nicaragua. Today, Nahuat, Mangue, Mayan and Chibcha words, along with their respective syntax, can be found in everyday speech. Also, as Nicaragua was a center-point of Mesoamerican and South American indigenous groups, there are a number of words widely used in Nicaragua which have Matagalpan, Chibcha, Miskito, Nahuatl, or other native origins, in particular names for flora, fauna and toponyms.

Notable characteristics of Nicaraguan phonology include the following: