| congregacionalista | congregational |
| congregación | congregation |
| Congregación Cristiana en el Brasil | Christian Congregation of Brazil |
| Congregación de la Pasión | Passionist |
| Congregación de los Hermanos Maristas | Marist Brothers |
| Congregación de los Sagrados Corazones | Congregation of the Sacred Hearts of Jesus and Mary |
| Congregación del Corazón Inmaculado de María | Congregatio Immaculati Cordis Mariae |
| Congregación del Oratorio de San Felipe Neri | Oratory of Saint Philip Neri |
| Congregación del Santísimo Redentor | Congregation of the Most Holy Redeemer |
| Congregación para la Doctrina de la Fe | Congregation for the Doctrine of the Faith |
| Congregación para la Evangelización de los Pueblos | Congregation for the Evangelization of Peoples |
| Congregación para las Iglesias Orientales | Congregation for the Oriental Churches |
| Congregación para los Institutos de Vida Consagrada y las Sociedades de Vida Apostólica | Congregation for Institutes of Consecrated Life and Societies of Apostolic Life |
| Congregación para los Obispos | Congregation for Bishops |
| congregar | assemble |
| congregarse | gather |
| congresista | conferee |
| Congreso | Congress |
| Congreso Americano | Capitol Hill |
| Congreso Continental | Continental Congress |
| Congreso de Chilpancingo | Congress of Chilpancingo |
| Congreso de Erfurt | Congress of Erfurt |
| Congreso de la Confederación | Congress of the Confederation |
| Congreso de la Nación Argentina | Argentine National Congress |
| Congreso de la República del Perú | Congress of Peru |
| Congreso de la Unión de México | Congress of Mexico |
| Congreso de Liberación Nacional Ngwane | Ngwane National Liberatory Congress |
| Congreso de los Diputados de España | Congress of Deputies |
| Congreso de los Estados Unidos | United States Congress |
| Congreso de Nacionalistas Ucranianos | Congress of Ukrainian Nationalists |
| Congreso de Troppau | Congress of Troppau |
| Congreso de Verona | Congress of Verona |
| Congreso de Viena | Congress of Vienna |
| Congreso del Partido Comunista de la Unión Soviética | Congress of the Communist Party of the Soviet Union |
| Congreso Internacional de Jóvenes Esperantistas | International Youth Congress of Esperanto |
| Congreso Internacional de Matemáticos | International Congress of Mathematicians |
| Congreso Latinoamericano y Caribeño por la Independencia de Puerto Rico | Latin American and Caribbean Congress in Solidarity with Puerto Rico’s Independence |
| Congreso Liberal Democrático | Liberal Democratic Congress |
| Congreso Nacional Africano | African National Congress |
| Congreso Nacional de Bolivia | National Congress of Bolivia |
| Congreso Nacional de Chile | National Congress of Chile |
| Congreso Nacional de Reconstrucción de Timor del Este | National Congress for Timorese Reconstruction |
| Congreso Nacional del Brasil | National Congress of Brazil |
| Congreso Nacional del Ecuador | National Congress of Ecuador |
| Congreso Nacional Indio | Indian National Congress |
| Congreso Solvay | Solvay Conference |
| Congreso Universal de Esperanto | World Congress of Esperanto |
| Congresos de Nuremberg | Nuremberg Rally |
| Congress of South African Trade Unions | Congress of South African Trade Unions |
| Congridae | Congridae |
| congrio | conger |
| congruencia | agreement |
| congruente | congruent |
| congruo | suitable |
| congénito | innate |
| Conidae | Cone snail |
| coniforme | coniform |
| Conios | Cynetes |
| Conium | Conium |
| Conium maculatum | Conium |
| conjetura | estimate |
| Conjetura abc | Abc conjecture |
| Conjetura de Collatz | Collatz conjecture |
| Conjetura de los números primos gemelos | Twin prime conjecture |
| Conjetura de Mertens | Mertens conjecture |
| Conjetura de Poincaré | Poincaré conjecture |
| Conjetura de protección de la cronología | Chronology protection conjecture |
| conjetural | conjectural |
| conjeturas | guesswork |
| conjugación | conjugation |
