I think I can make out most of this ...

[mezentia]

but I'd like a few second opinions It's a marriage between John Stonyer and Sarah Harrison.

[Bookbox]

John Stonyer(?) of this Parish
in the County of Derby Miller and Sarah Harrison of the
Parish of (...)bridge in the County of Derby Spinster were
Married in this Church by Licence
this twenty first Day of September in the Year One Thousand Seven
Hundred and ninety five by me Christopher (...) Minister
This Marriage was solemnized between Us  John Stonyer
                                  Sarah Harrison
In the Presence of W^m Marshall 
William Coxon
Mary Harrison

Presumably you already know the parish, so it shouldn’t be too difficult to find the minister’s name.

ADDED -- on 2nd thoughts, Sarah's parish probably ends ...bridge.

[Ruskie]

I was just about to offer my contribution but Bookbox has already solved the puzzle.

One thing I am unsure of is Sarah's parish.

I agree that it reads "Sarah Harrison of the Parish of D-------* in the county of Derby Spinster"

* this word looks a bit longer than "Derby" I think. 

[Bookbox]

* this word looks a bit longer than "Derby" I think. 

As added above, while Ruskie was posting 
If the OP would care to identify the parish for the marriage, we might be able to come up with some suggestions?

[mezentia]

I don't think Sarah's parish is Derby as whatever it is doesn't match other occurrences of Derby. I've got a list of parishes in Derbyshire that start with a D, and it doesn't seem to be any of them
John's parish is Snelston. Christopher ? seems to be an officiating minister rather than the vicar. Previous entries have Thomas Benjamin as the rector. The image is from Ancestry; there's not one on FindMyPast, and only a transcription on Familysearch.

Sarah has a middle name?

[Ruskie]

* this word looks a bit longer than "Derby" I think. 

As added above, while Ruskie was posting 
If the OP would care to identify the parish for the marriage, we might be able to come up with some suggestions?

ah I didn't notice that addition. 

mezentia, is that entry anywhere online so we can have a look to see if it is any clearer? Some of the clever people on here can fiddle with the contrast etc to enhance images, so I hope one of them joins this thread.

[Bookbox]

How about Dovebridge, old name for Doveridge?

[mezentia]

Dovebridge/Doveridge makes sense, they're close-ish parishes.

[Ruskie]

I think Dovebridge works. I can't see the tail of the g, but the other letters fit well.