The nine prison staff, from HMP Bure based near Coltishall, are growing moustaches to help raise money for Help for Heroes and have nicknamed their attempt, Handlebars for Heroes.
They started their fundraising mission on October 1 and will finish on December 20.
Richard Duncan, 46, is one of those taking part.
He said: 'It all came about one Sunday lunchtime, when I suggested to the others about growing moustaches, then we said if we were going to do it, why not do it for charity. It just grew from there.
'We have everyone involved from the catering staff, through to the prison officers.'
In fact the group even have an honorary female member, Linsey Wilson, 29, who works in the canteen, and is supporting them by wearing her own fake moustache.
The rules are strict though – only moustaches allowed, no beards, and if anyone weakens and has their moustache shaved off before December 20, the forfeit they pay is having one leg waxed.
Mr Duncan said: 'It is all going good, but I do not think I am very popular with the guy's wives, but it is all for a good cause.'
So far, between them, the group, none of whom have grown moustaches before, have managed to raise around �800 in sponsorship.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here