Laddu or laddoo is a spherical sweet from the Indian subcontinent made of various ingredients and sugar syrup or jaggery. It has been described as "perhaps the most universal and ancient of Indian sweets."

Laddus are often served during celebrations and religious festivals, especially those associated with the Hindu deity Ganesha.

The word laddu is derived from a Sanskrit term meaning "small ball."

In the 3rd-4th century Sanskrit medical text Sushruta Samhita, ladduka are described as small balls of jaggery, peanuts, and sesame seeds coated with honey. These balls were used as an antiseptic and to deliver medication.

However, the first documented mention of laddu as a sweet is in the 11th-century Western Indian cookbook Lokopakara. It gives a recipe for making laddus with shavige (rice vermicelli), ghee, and sugar syrup, which were formed into balls and fried in ghee. The 15th-century Indian cookbook Nimatnama-i-Nasiruddin-Shahi gives several recipes for laddus made with white flour, dried fruits, rosewater, camphor, and musk.

Besan laddu is the most common variety. To prepare it, besan (chickpea flour) is fried in hot ghee (clarified butter). Sugar and cardamom powder are then mixed in. The mixture is formed into balls and allowed to cool and solidify.

Motichoor ("crushed pearls" in Hindi) laddu is made from boondi, tiny fried balls of chickpea batter soaked in sugar syrup.

Thaggu ke ("Cheat's") laddu is made from khoa (condensed milk), semolina, and white sugar and is a specialty of Kanpur, India. It was invented by Mattha Pandey, a follower of Mahatma Gandhi. Pandey heard Gandhi refer to white sugar, which was popularized in India by the British, as "white poison" and disease-causing. Since his laddu was made with white sugar, he named it accordingly.