
The Janssen baronetcy, of Wimbledon in the County of Surrey, was a title in the Baronetage of Great Britain. It was created on 11 March 1715 for the Dutch-born financier Theodore Janssen, who later represented Yarmouth in the House of Commons.
The 2nd Baronet sat as Member of Parliament for Dorchester; while the 4th Baronet was Member of Parliament for the City of London and a Lord Mayor of London. The title became extinct on the latter's death in 1777.
The 4th Baronet's only daughter Henrietta Janssen (born 1752, died 29 July 1840 Twickenham, aged 87) married Lorenzo Moore, MP for Dungannon in Ireland.