Slatko (Serbian: слаткō / slatkō; Macedonian: слатко, romanized: slatko; Bulgarian: сладко, romanized: sladko; meaning "sweet") is a thin fruit preserve made of fruit or rose petals in Bulgarian, Macedonian, and Serbian cuisine.

[1] Traditionally, all guests in Serbian and Bulgarian homes are greeted with a spoonful of slatko/sladko and a cup of water immediately after being seated.

Prior to the creation of Yugoslavia, the tradition of slatko was common and widespread only in the historical Serbia, south of Sava and Danube, and was unknown in Vojvodina or other parts of Austro-Hungarian Empire.

The most common types of slatko are those made of whole strawberries, slightly unripe skinned plums or sour cherries.

Other fresh fruits like raspberries, sweet cherries, watermelon cubes, rose petals, quinces, grapes, figs, skinned apricot halves or quarters, peaches, blueberries, blackberries or redcurrants can also be used.