Río San Juan Department

{{short description|Department of Nicaragua}}

{{More citations needed|date=January 2021}}

{{Infobox settlement

| name = Río San Juan

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| settlement_type = Department

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| subdivision_type = Country

| subdivision_name = Nicaragua

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| image_map = Rio San Juan Department in Nicaragua.svg

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| seat = San Carlos

| seat_type = Capital

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| area_total_km2 = 7543

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| population_as_of = 2021 estimate

| population_footnotes = [https://www.citypopulation.de/en/nicaragua/cities/ Citypopulation.de] Population of departments in Nicaragua

| population_total = 137189

| population_density_km2 = auto

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| population_urban = 36965

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| blank_name = ISO 3166-2

| blank_info = NI-SJ

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Río San Juan ({{IPA|es|ˈri.o saŋ ˈxwan}}) is a department in Nicaragua. It was formed in 1957 from parts of Chontales and Zelaya departments. It covers an area of 7,543 km² and has a population of 137,189 (2021 estimate). The capital is San Carlos. The department also includes the Solentiname Islands archipelago and the San Juan River, after which it is named. Trinidad, in Río San Juan, is the most southerly point in Nicaragua.