The Ulster Ravens hosted Neath in last season's British & Irish Cup, going down to a 25-20 defeat at Shaw's Bridge last January.
Jamie Smith and Tommy Seymour, who have since move away from the province, were their try scorers on the night.
The newly-announced fixture brings the total number of pre-season matches for Ulster to three, with the following games already confirmed - away to Bayonne on Wednesday week (August 10) and at home to Harlequins on Friday, August 26.
Tickets for the home friendly against 'Quins are now on sale from the Ulster Rugby website or from the Ticket Office on tel: 028 9049 3222.
ULSTER PRE-SEASON FIXTURES:
Wednesday, August 10 - Bayonne v Ulster, Parc des Sports Jean Dauger, 8pm
Friday, August 19 - Neath v Ulster, the Gnoll, 7.15pm
Friday, August 26 - Ulster v Harlequins, Ravenhill, 7.30pm