Шпански јазик () или познат како кастиљски јазик () — романски јазик од групата на ибероромански јазици. Јазикот се развил од неколку јазици и дијалекти кои се зборувале во централниот дел на Пиринејскиот Полуостров во IX векLa RAE avala que Burgos acoge las primeras palabras escritas en castellano (Castilian). www.elmundo.es. Јазикот постепено се зголемувал и се приширувал со експанзијата на Кралството Кастиља.
Соврмениот кастиљски јазик се развил со прераспоредување на согласките, процес кој започнал во XV век. Јазикот постепено почнал да создава нови зборови, како од домашно, така и од странско потекло. Јазикот станал значаен со шпанската колонизација на Америка, Африка и делови од Азија - колонизација која била предводена од Шпанската империја во периодот од 15 до XIX век. Во тој период јазикот станал најзначаен јазик за владата и трговијата.
Географска распространетост Кастиљскиот е признат како службен во над 20 држави и поголем број меѓународни организации. Во следната табела е наведено присуството на шпанскиот по држави.
државанаселениешпанскиот како мајчин јазикBritannica Books of the years 2003 to 2009 :es:Anexo:Hablantes de español como lengua materna en el 2003 (según el Britannica Book). Sources used by the Encyclopaedia Britannica (Ethnologue -14th edition, Joshua Project 2000 —People's List, U.S. Census Bureau.)шпанскиот како втор јазик во држави каде шпанскиот е службенeurobarometer (2006), :es:Anexo:Hablantes de español en la U.E. según el Eurobarómetro (2006) for Europe countries, или како странски јазик во држави каде не е службенSpanish students for countries out of Europe according to Instituto Cervantes 06-07 (There aren't concrete sources about Spanish speakers as a second language except to Europe and Latin America countries).Процент на шпански говорници од населениетоDemografía de la lengua española (page 28) to countries with official spanish status.Вкупно шпански говорници 112.336.538 CONAPO (2010). cia.gov : Spanish only 92,7% 98,5% 307.006.550 Population figure for 2009 from U.S. Population in 1990, 2000, and 2009 , U.S. Census Bureau35.468.501 Hispanics older than 5 years old (US Census Bureau 2009 ) 14.531.499 % 50.000.000Academia Norteamericana de la Lengua Española: elcastellano.org , José Ma. Ansón: noticias elcastellano.org , Jorge Ramos Avalos: univision.com , Elbio Rodríguez Barilari: congresosdelalengua.es , III Acta Internacional de la Lengua Española , nytimes.com (The United States is now the second-largest Spanish-speaking country in the world, with more Spanish speakers than Spain, and exceeded only by Mexico).There are 50.477.594 Hispanic people from a total US population of more than 308 million according to the Census Bureau 2010. 35.468.501 Hispanics older than 5 speak Spanish at home, so there are 15 million posible Spanish speakers as a second language with differents knowladges. In addition, there are 6 (cervantes.es) или 7,8 (fundacionsiglo.com ) million Spanish students in USA, many of them are not Hispanics. Finally, there are 9 million illegal Hispanics in USA, some of them aren't in the census (impre.com ). 47.150.819 89,0% speak Spanish as a first language (eurobarometer (2006)) 98,8% 46.240.000 There are 500.000 speakers of American Indian languages (Ethnologue) 130.080 99,2% 40.900.496 36.333.605 There are 4.566.891 people who speak other language as their mother tongue (main languages: 1.500.000 Italian, 1.000.000 Arabic, 855.000 Quechua, 400.000 German, 200.000 Paraguayan Guaraní, 200.000 Eastern Yiddish): Ethnologue. Spanish is the only official language and is spoken by nearly all the population. Italian, Arabic and the indigenous South American language Quechua are also spoken by about 1 million or more people each.spanish.about.com 4.321.488 99,4% 29.434.660 There are 1.076.953 people who speak other language as their mother tongue (main languages: Chinese 400.000, Portuguese 254.000, Wayuu 170.000, Arabic 110.000): Ethnologue. 725.281 98,8% 29.797.694 Spanish (official) 84,1%, Quechua (official) 13%, Aymara 1,7%, Ashaninka 0,3%, other native languages (includes a large number of minor Amazonian languages) 0,7%, other 0,2% (2007 Census): cia.gov . There are 5.782.260 people who speak other language as mother tongue (main languages: Quechua (among 32 Quechua's varieties) 4.773.900 , Aymara (2 varieties) 661 000, Chinese 100.000). Ethnologue 744.942 86,6% 17.291.300 17.041.797 There are 249.503 people who speak another language, mainly Mapudungun (200,000): Ethnologue 85.914 99,3% 14.306.000 11.907.200 There are 2.398.800 people who speak another language, mainly American Indian languages (2.300.000).: Ethnologue 2.126.986 98,1% 14.361.666 Spanish (official) 60%, Amerindian languages 40%: cia.gov 86,4% 11.235.863 11.235.863 ethnologue.com 99,4% 10.225.000 10.006.500 There are 218.500 people who speak other language as mother tongue (main language: Haitian with 159.000 speakers). Ethnologue 177.600 99,6% 10.426.154 According to the 1992 Census, 58 per cent of the population speaks Spanish as its mother tongue. unicef.org 87,9% 8.215.313 8.007.563 There are 207.750 people who speak another language, mainly Garifuna (98.000).: Ethnologue 125.597 99,0% 6.183.002 Census 2010 estimation (page 32) 6.168.902 There are 14.100 people who speak other language as their mother tongue (main language, Kekchí with 12.300 speakers): Ethnologue. 99,7% 65.821.885 Official INSEE estimate to 1/1/2011 440.106 1% of 44.010.619 (population of France older than 15 years in 2005). Source: Eurobarometer 2006. There are 189.909 immigrants from Spain according to INE (1/1/2011) 5.721.380 9,4% 6.161.486 5.822.000 5.331.876 There are 490.124 people who speak another language, mainly Mískito (154.000).: Ethnologue 315.464 97,0% 31.759.997Morocco census 20.000 5.480.000 17,32% 5.500.000 there are between 4 and 7 million Spanish speakers in Morocco (Ammadi, 2002) educacion.es According to a survey made in 2005 by CIDOB, 21,6% of the population speak Spanish (realinstitutoelcano.org , afapredesa.org ). According to the Morocco Census of 2004, the Morocco population is 29.680.069 (hcp.ma) 190.732.694 IBGE 2010 460.018 50% of 733.000 foreigners in Brazil are from Mercosur (Page 32 + 92.260 spanish immigrants (INE (1/1/2011)) + 1.258 (in 2000). 5.000.0002009 Annuary of the Instituto Cervantes: More than 5 million students are learning Spanish. elcastellano.org ,elespectador.com , oei.org.co : Luiz Inácio Lula da Silva, president of Brazil: Near 9 million students are learning Spanish and the forecast is 12 million in 2010. Instituto Cervantes: More than 1 million of spanish students in the private school and almost 11 million estimated for 2010 in the public school. 2,86% 5.460.018 4.615.646 4.530.228 [There are 85.418 people who speak another language.: http://www.ethnologue.com/show_country.asp?name=CR Ethnologue] 48.493 99,2% 6.460.000 3.682.200 According to the 1992 census, 50% use both Spanish and the indigenous language Guarani at home, 37% speak Guarani only, 7% speak Spanish only.findarticles.com . About 75 percent can speak Spanish.pressreference.com 446.145 69,5% 3.998.000 95,10% of the population speaks Spanish (U.S. Census Bureau ) 98,8% 62.041.708 Eurostat 2010 184.867 90.000 Colombians (in 2003) + 64.317 Spanish (in 2011) + 10.455 Mexicans (in 2009) + 7.554 Argentinians (in 2008 ) + 5.131 chileans (in 2004 ) + 7.410 Peruvians (en 2008 ) 3.737.633 6,4% 3.922.500 3.372.000 3.221.800 There are 150.200 people who speak another language as mother tongue Ethnologue 113.108 98,9% 3.508.000 3.006.957 There are 501.043 people who speak another language as mother tongue.: Ethnologue 258.991 93,1% 94.013.200 National Statistics Office medium projection (Mid-2010) 2.930 There are 2.930 immigrants from Spain according to INE (1/1/2011) 3.013.843 3,2% 3.016.773 1.816.773 Spanish + 1.200.000 Spanish creole: Antonio Quilis "La lengua española en Filipinas", 1996 pag,234 cervantesvirtual.com,