| Großer Plöner See | |
| Native Name Lang: | de |
| Settlement Type: | Amt |
| Subdivision Type: | Country |
| Subdivision Name: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Schleswig-Holstein |
| Subdivision Type3: | District |
| Subdivision Name3: | Plön and Ostholstein |
| Seat Type: | Region seat |
| Seat: | Plön |
| Leader Title: | Amtsvorsteher |
| Leader Name: | Gerold Fahrenkrog |
| Area Total Km2: | 187.83 |
| Population Total: | 4,571 |
| Population As Of: | 2020-12-31 |
| Website: | www.amt-grosser-ploener-see.de |
Großer Plöner See is an Amt ("collective municipality") in the districts of Plön and Ostholstein in Schleswig-Holstein, Germany. It is situated around Plön, which is the seat of the Amt, but not part of it. The Amt is named after the lake Großer Plöner See.
It is one of the two Ämter (with Itzstedt) in Germany that joins municipalities into two different districts, but only Bosau is located in Ostholstein.
The Amt Großer Plöner See consists of the following municipalities: