1990 in São Tomé and Príncipe

The following lists events that happened during 1990 in the Democratic Republic of São Tomé and Príncipe.

Incumbents

 * President: Leonel Mário d'Alva (acting)
 * Prime Minister: Celestino Rocha da Costa

Events

 * May: politician Miguel Trovoada returned to São Tomé and Príncipe from exile in France
 * 22 August: A Constitutional referendum took place, it became a multi-party democracy
 * October: at the MLSTP party Congress, Carlos Graça was appointed as the new Secretary-General of the party. In addition, the party's name was amended to the Movement for the Liberation of São Tomé and Príncipe/Social Democratic Party (MLSTP/PSD).
 * 4 November: the Democratic Convergence Party – Reflection Group (PCD-CR) was founded

Sports

 * GD Os Operários won the São Tomé and Príncipe Football Championship