Prowse has been married since 1963 to Norma E. Scammell and is the father of three children.
He is a prominent supporter of Bristol Rugby Club.
Prowse has lived in Addiscombe, Croydon since 1963.

On 13 May 2009, Prowse publicly declared his support for the United Kingdom Independence Party in the 2009 European Parliament election.
Prowse said that "I've looked right and left and right again and the only party I can safely vote for is UKIP," and "...I have two messages for those considering how to vote.
Firstly, stop, look and listen to what is being said.
Only UKIP is actually telling us the truth about the European Union and why we need to leave it.
Secondly, may June the fourth be with you."
Prowse has been married since 1963 to Norma E. Scammell and is the father of three children. He is a prominent supporter of Bristol Rugby Club. Prowse has lived in Addiscombe, Croydon since 1963.
On 13 May 2009, Prowse publicly declared his support for the United Kingdom Independence Party in the 2009 European Parliament election. Prowse said that "I've looked right and left and right again and the only party I can safely vote for is UKIP," and "...I have two messages for those considering how to vote. Firstly, stop, look and listen to what is being said. Only UKIP is actually telling us the truth about the European Union and why we need to leave it. Secondly, may June the fourth be with you."
David Prowse