| Isdhoo | |
| Native Name Lang: | dv |
| Settlement Type: | Inhabited island |
| Pushpin Map: | Maldives |
| Pushpin Relief: | y |
| Pushpin Mapsize: | 250 |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location in Maldives |
| Coordinates: | 2.1194°N 73.5694°W |
| Subdivision Type: | Country |
| Subdivision Name: | Maldives |
| Subdivision Type1: | Geographic atoll |
| Subdivision Type2: | Administrative atoll |
| Subdivision Name2: | Laamu Atoll |
| Subdivision Type3: | Distance to Malé |
| Subdivision Name3: | 227.43km (141.32miles) |
| Seat Type: | Capital |
| Parts Type: | Geographic atolls |
| Parts Style: | list |
| Leader Title: | Council |
| Leader Title3: | Mayor |
| Leader Title4: | Island Chief |
| Unit Pref: | Metric |
| Length Km: | 4.370 |
| Width Km: | 1.525 |
| Population Footnotes: | [1] |
| Population Total: | 958 (including foreigners) |
| Population As Of: | 2014 |
| Population Density Km2: | auto |
| Utc Offset: | +05:00 |
| Postal Code Type: | Assigned Letter |
| Postal2 Code Type: | Assigned Letter |
| Area Code Type: | Area code(s) |
| Blank Name Sec2: | Number of Islands |
| Blank1 Name Sec2: | Inhabited |
| Blank2 Name Sec2: | Uninhabited |
| Blank3 Name Sec2: | Total |
Isdhoo or Isdū (according to the Admiralty charts) (Dhivehi: އިސްދޫ) is one of the inhabited islands of Haddhunmathi Atoll, administrative code Laamu part of Maldives in the Indian Ocean.
This island has important ruins from the historical Maldivian Buddhist era. These ruins include one of the largest stupas so far found in the Maldives.
Lōmāfānu are ancient royal edicts written on copper plates.[2] Lōmāfānu edicts were etched on long copper plates held together by a ring of the same metal. The lōmāfānu were written in the curly Evēla form of the Divehi akuru or old Maldive alphabet and they are very important documents in the History of the Maldives.[3] The oldest lōmāfānu that have hitherto been found and preserved are from Malé, the royal capital, and from the islands of Isdū and Dambidū in Haddhunmathi Atoll, where there were large Buddhist monasteries. These copperplates were issued at the end of the twelfth century AD.[3] These (lōmāfānu), make it clear that the general conversion from Buddhism to Islam was ordered by the king. Thanks to the lōmāfānu it is also known that the monasteries in Haddummati Atoll (Satu Duvu) were of great importance in the ancient Buddhist Kingdom of the Maldives.
According to the Isdū Lōmāfānu, monks from monasteries of the southern atoll of Haddhunmathi were brought to Malé and beheaded.
The island is 227.430NaN0 south of the country's capital, Malé.[4]