|Firth of Tay|
|Location||Scotland, United Kingdom|
|Official name||Firth of Tay and Eden Estuary|
|Designated||28 July 2000|
The Firth of Tay (//; Scottish Gaelic: Linne Tatha) is a firth on the east coast of Scotland, into which the River Tay (Scotland's largest river in terms of flow) empties. The firth is surrounded by four council areas: Fife, Perth and Kinross, City of Dundee, and Angus. Its maximum width (at Invergowrie) is 3 mi (4.8 km). 
The Firth of Tay in Antarctica was discovered in 1892–93 by Captain Thomas Robertson of the Dundee whaling expedition and named by him after the one in Scotland. He also named nearby Dundee Island in honour of the main city on the firth.
The Firth of Tay and the Eden Estuary (which lies 8 miles to the south of the firth) were designated as Special Protection Areas on 2 February 2000, as Ramsar wetlands a few months later (on 28 July 2000), and as Special Areas of Conservation five years later (on 17 March 2005). Several parts of the firth are within a site of special scientific interest – Inner Tay Estuary, Monifieth Bay, Tayport-Tentsmuir Coast. The Invergowrie Bay section of the firth is a local nature reserve.
The Firth of Tay is noted for its extensive sand and mudflats, its population of common seals, and its wintering birds (such as oystercatcher, bar-tailed godwit, shelduck and velvet scoter). There is good access to much of the shoreline, and the firth offers many good wildlife-watching opportunities.
The reed bed on the north shore of the inner estuary in the firth is about 15 km long; it is thought to be the most extensive reedbed in Britain.
Towns and villages along the coast
- Broughty Ferry
Places of interest
- Balmerino Abbey
- Broughty Castle Museum
- Mugdrum Island
- Tay Rail Bridge
- Tay Road Bridge
- Tentsmuir Forest
- Tentsmuir National Nature Reserve
- "Firth of Tay and Eden Estuary". Ramsar Sites Information Service. Retrieved 25 April 2018.
- "Tay, Firth of". Angus Council. Archived from the original on 7 September 2008. Retrieved 26 February 2012.
- "The Tay Bridges". Tay Estuary. Archived from the original on 14 January 2013. Retrieved 26 February 2012.
- "Historical perspective for Mugdrum Island". Gazetteer for Scotland. Retrieved 26 February 2012.
- "Tay, Firth of". Geographic Names Information System. United States Geological Survey. Retrieved 23 March 2012.