Thomas de Keyser (c. 1596–1667) was a Dutch painter and architect.De Keyser was born and died in Amsterdam. He excelled as a portrait painter, and was the most in-demand portrait painter in the Netherlands until the 1630s, when Rembrandt eclipsed him in popularity. Rembrandt was influenced by his work, and many of de Keysers paintings were later falsely attributed to Rembrandt.