Mr O’Hara, 47, was one of two men who lost their lives following a crash on the Ravenhill Road on Saturday night.
He had been returning from Ulster’s match against Clermont.
Ulster Rugby CEO Jonny Petrie: “We are deeply saddened by the passing of lifelong Ulster supporter, Jon O’Hara, and our thoughts as a club are with his family and friends at this difficult time.
“I was able to pay my respects in-person at yesterday’s funeral service, which was important to honour Jon’s support of Ulster Rugby over the years on behalf of our players and staff.
“Tonight, we will hold a moment of silence ahead of the game to remember Jon.”
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