Sasbout Vosmeer (13 March 1548, in Delft – 3 May 1614, in Cologne) was the first apostolic vicar to the Dutch Mission and succeeded Frederick Schenck van Toutenberg, the second Archbishop of Utrecht (1602–1614).

He studied in Leuven and ordained priest in 1572 by archbishop of Utrecht Frederik V Schenck van Toutenburg.

[1] Vosmeer was officially appointed to head the Catholic community in the Dutch Republic as vicar apostolic by Pope Clement VIII in Rome on 22 September 1602, on which occasion he was also made titular archbishop of Philippi (since it was impossible to make him archbishop of Utrecht).

When it became clear that his role was to reorganise the Dutch Catholic church he was banned from the Republic in 1603, continuing the Mission's work from Cologne.

Vosmeer tended towards inflexibility and instructed believers to refuse any decision of the States that could lead to an emergency, though this policy of his led to criticism from the Jesuits.