Loch Gelly (Scottish Gaelic: Loch Gheallaidh) is a small loch in Fife, Scotland lying approximately 1.5 km to the south east of the town of Lochgelly which itself is named after the loch.

[2] It is a broad, shallow flat bottomed basin approximately 1.75 km in length from west to east and 0.75 km wide at its maximum breadth.

In May 1583, Sir John Wemyss built a fort on the south side of the loch and kept an armed boat to prevent the Boswells of Balmuto from fishing in the loch.

[3] Land around the loch is owned by Wemyss 1952 Trustees.

[4] The loch was surveyed[1] on 11 May 1905 by Sir John Murray and later charted[5] as part of The Bathymetrical Survey of Fresh-Water Lochs of Scotland 1897-1909.