too many to name...here go some though:
kc & the sunshine band - 'i'm your boogyman' ; 'shake, shake shake'; 'get down tonight'
the brothers Johnson - 'strawberry letter 22'; 'i'll be good to you'
eddie murphy - 'party all the time'
morris day & the time - 'jungle love'; 'the bird'; '777-9311'
prince - anything
Sheila e - 'glamorous life'; 'a bizarre love (the long version)'
and even though it aint 80s funk: that new daft punk album....that shyt is so funky...
....and I know a lot of of the songs I listed can fall into rnb too, but it's a thin line between a lot of the music then...so I listed songs just with funky ass beats you chill too....
edit - i'm give that man his due, George mccrae - 'I get lifted'
a couple more:
bill withers - 'use me' (listened to this song for bot 3 hours straight one day while at work...yes, that's how much I dig that shyt)
William devaughn - 'diamond in the back'