| Official Name: | City of Guaraqueçaba |
| Mapsize: | 250px |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Type2: | State |
| Subdivision Name: |  Brazil |
| Subdivision Name1: | South |
| Subdivision Name2: | Paraná |
| Leader Title: | Mayor |
| Leader Name: | Riad Said Zahoui (PSB) |
| Established Title: | Founded |
| Established Date: | October 10, 1947 |
| Area Total Km2: | 2018.906 |
| Population As Of: | 2020 [1] |
| Population Total: | 7,594 |
| Population Density Km2: | 4.3 |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Coordinates: | -25.3069°N -48.3289°W |
| Elevation M: | 10 |
| Blank Name: | HDI (2000) |
| Blank Info: | 0.659 – medium[2] |
Guaraqueçaba is the easternmost municipality in the Brazilian state of Paraná, and one of the few coastal municipalities of the state. The short Ararapira River marks the border with São Paulo.
Guaraqueçaba has historical significance, being among the first Portuguese settlements in the state of Paraná in 1545.
In 1938 the municipality of Guaraqueçaba was abolished and its territory was absorbed into that of Paranaguá. However, in 1947 Guaraqueçaba had it municipal rights restored.
The municipality contains the Salto Morato Private Natural Heritage Reserve, created in 1994.It contains the Sebuí Private Natural Heritage Reserve, created in 1999.It contains the Guaraqueçaba Ecological Station in the coastal mangrove area.It also holds 53% of the Bom Jesus Biological Reserve, a strictly protected conservation unit established in 2012.