Protocol of St. Petersburg

The Protocol of St. Petersburg may refer to:


 * Protocol of St. Petersburg (1826), an Anglo–Russian treaty about the Greek War of Independence
 * Protocol of St. Petersburg (1887), treaty of the Afghan Boundary Commission regarding Afghanistan's border with Russia
 * Protocol of St. Petersburg (1904), an international anti-anarchist treaty
 * Protocol of St. Petersburg (1913), a Bulgarian–Romanian treaty through which Bulgaria ceded Silistra to Romania