| Kaunissaare Reservoir | |
| Location: | Anija Parish, Harju County, Estonia |
| Pushpin Map: | Estonia |
| Type: | Reservoir |
| Inflow: | Jägala River, Mulkoja, Aavoja-Kaunissaare Canal |
| Outflow: | Jägala River, Jägala–Pirita Canal |
| Basin Countries: | Estonia |
| Date-Built: | 1980 |
| Date-Flooded: | 1984 |
| Islands: | 2 |
| Cities: | Kaunissaare |
| Part Of: | Tallinn water supply system |
| Agency: | Tallinna Vesi |
| Residence Time: | 3-5 weeks |
Kaunissaare Reservoir is located on Jägala river in Kaunissaare Village, Anija Parish, Harju County, Estonia, near Kehra.
The reservoir is part of the Tallinn water supply system and is connected to Pirita, Soodla and Aavoja rivers via canals.
The area of the reservoir is, average depth is and maximum depth is .[1]
The construction of the reservoir took place between 1980 and 1984.[2]
A fish passage was built between the reservoir and downstream Jägala river in 2015.[3]