The social media firm said it found just three ads linked to the Russia-based Internet Research Agency (IRA) and they were viewed by just 200 people.
The revelations come after the Electoral Commission asked Facebook and Twitter for information on any Russian attempts to interfere with the Brexit vote.
It follows an investigation in the US earlier this year which ruled hundreds of Russia-linked Facebook accounts had attempted to influence the US presidential election.
The findings cast doubt over assertions by pro Remain MPs that Moscow-based propaganda groups were trying to sway the vote by posting ads online.
In a letter to the Commission Facebook said: ‘We strongly support the Commission’s efforts to regulate and enforce political campaign finance rules in the United Kingdom, and we take the Commission’s request very seriously.
‘Further to your request, we have examined whether any of the identified Internet Research Agency pages or account profiles funded advertisements to audiences in the United Kingdom during the regulated period for the EU referendum.
‘We have determined that these accounts associated with the IRA spent a small amount of money (97 cents, or 73p) on advertisements that delivered to UK audiences during that time.
‘This amount resulted in three advertisements (each of which were also targeted to US audiences and concerned immigration, not the EU referendum) delivering approximately 200 impressions to UK viewers over four days in May 2016.’