The oldest sword found in the world is a topic of debate and can vary depending on the criteria used to define a sword. However, one notable candidate is the "Arsenical bronze sword" found at the Harappan site of Lothal in modern-day Gujarat, India. This sword dates back to around 2300 BC, during the Bronze Age. It is a short sword with a copper blade that has a high arsenic content, giving it enhanced strength and sharpness. The sword was discovered in a hoard of ancient artifacts and is considered one of the earliest examples of a sword-like weapon.

It's worth noting that earlier bladed weapons, such as daggers and knives, have been found in various archaeological sites around the world. For example, the "Iceman" Ötzi, who lived around 3300 BC, was discovered in the Italian Alps with a copper-bladed knife, making it one of the oldest preserved bladed weapons. However, when specifically referring to swords, the arsenical bronze sword from Lothal is often regarded as one of the oldest known examples.