Richard Samuel Guinness (7 June 1797 – 27 August 1857) was an Irish lawyer and a Member of Parliament.
Guinness was called to the bar at the King's Inns in Dublin and practised as a barrister.
He then worked as a land agent, trading as "R. Guinness & Co.", but found it difficult in the aftermath of the Irish famine of the 1840s.
However, an election petition was filed by the losing Whig candidate, W. H. Watson, and early in 1848 a select committee found that Guinness's agents' generous hospitality in providing free drinks for the electorate of Kinsale in Kiley's public house had amounted to bribery.
On 25 November 1833, at the residence of the British ambassador to France, in Verdun,[3] Guinness married Katherine Frances Jenkinson, a daughter of Sir Charles Jenkinson, 10th Baronet and his wife Katherine Campbell, a daughter of Walter Campbell of Shawfield.