| Subdivision Type: | Country |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Official Name: | Nagyszékely |
| Subdivision Type1: | County |
| Subdivision Name1: | Tolna |
| Area Total Km2: | 36.7 |
| Population Total: | 441 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 7085 |
| Area Code: | 74 |
| Pushpin Map: | Hungary |
| Coordinates: | 46.6461°N 18.5283°W |
Nagyszékely (German: Großsäckl) is a village in Tolna county, Hungary. Until the end of World War II, the inhabitants' majority was Protestant Danube Swabian (Schwowe) whose ancestors once arrived in 1720 - 1722 from Hanau. Most of the former German settlers were expelled to Allied-occupied Germany and Allied-occupied Austria in 1945–1948, following the Potsdam Agreement.[1]
Around 1790, Catholic German families from Nagyszékely settled in Illocska.