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Giovanni Andrea Lampugnani (died December 26, 1476) was a member of the Milanese nobility and an assassin of Galeazzo Maria Sforza, the Duke of Milan.

The Lampugnani family was a high-ranking family in Renaissance Milan, and Giovanni served in several government positions, often working quite closely with the Duke. Under the Duke, Giovanni's brothers leased some valuable land from a rural abbey. Upon the death of the abbot, the inheriting cleric nullified the lease and evicted the Lampugnani brothers from the property. Although the family appealed to the Duke, there was no government intervention on the matter, resulting in utter contempt on the part of Giovanni.

The Duke, although popular as a patron of the arts, was known to be rather ruthless in his rule and something of a womaniser, traits which encouraged more enemies to emerge amongst the government ranks. Two other officials, Carlos Visconti and Gerolamo Olgiati soon joined Giovanni in a conspiracy to assassinate the Duke.

Despite evidence that plotting may have begun as early as 1474, there was little planning on the conspirators' part beyond the actual assassination; no efforts were made to find further outside support amongst any ruling families, nor were getaway plans solidified.

Giovanni, the leader of the plot, gathered in the church of Santo Stefano on December 26, 1476 (the day of the martyr, Santo Stefano) to prepare for the assassination. Armed and wearing hidden armour, they convened before Mass in the morning, praying for the saint's protection.

When the Duke's procession arrived, Giovanni, Visconti and Olgiati stepped before the Duke, Giovanni going down on one knee. After a brief exchange of words, Lampugnani rose suddenly, stabbing the Duke in the groin and chest. Soon he was joined by Visconti, Olgiati and a servant of Lampugnani's named Franzone, stabbing the Duke to death.

Pandemonium erupted quickly, as the congregation - assassination included - fled the church. Giovanni, in an attempt to escape, ran to the women's side of the church where he was subsequently caught and killed. His head was severed and, with the heads of other assassins (who were all apprehended and executed within a week) displayed on the belltower as a warning for several years following.

In the days immediately following the Duke's assassination, other Lampugnani family members were arrested on suspicion of compliance and much of their property destroyed by mobs. Most of the remaining Lampugnani fled Milan or was exiled to other cities.

• Martines, Lauro (2003). April Blood: Florence and the Plot Against the Medici. New York: Oxford University Publisher.