The Late Late Show, with its title often shortened to The Late Late, is an Irish chat show. It is the world's second longest-running late-night talk show, after the American The Tonight Show, and is the longest-running live talk show. Perceived as the official flagship television programme of RTÉ, it is regarded as an Irish television institution, and is broadcast live across normally two hours in front of a studio audience on Friday nights at 9:30 pm between September and May. Certain segments are sometimes pre-recorded and aired within the live parts of the show.

Having maintained the same name and format continuously, The Late Late Show was first broadcast on Friday 6 July 1962 at 11:20 pm and in colour from 1976. Originating as temporary summer filler for a niche Saturday night audience (airing at 11:30 pm), it later moved to its current home on Friday night schedules. The format has remained largely the same throughout, featuring interviews, musical performances and discourse on topical issues. It has influenced attitudes of the populace towards approval or disapproval of its chosen topics, directed social change and helped shape Irish societal norms. It averages 650,000 viewers per episode and has consistently achieved RTÉ's highest ratings.

For much of its early life, RTÉ Television Centre's Studio 1 at Montrose in Donnybrook, Dublin 4, was its home; this original studio accommodated a small audience of about 120. In 1995, The Late Late Show transferred to the more spacious Studio 4, adapted specifically to cater for this and Kenny Live. Three external broadcasts have aired, including from the Wexford Opera House on 5 September 2008 and, most recently, from London in 2018.

Gay Byrne hosted the show from its inception until 21 May 1999. Pat Kenny was Byrne's successor, hosting the show for ten years between 1999 and 2009. Ryan Tubridy succeeded Kenny in September 2009 and hosted the show for fourteen years. Under Tubridy, first Quinn Group and then Sky Broadband added sponsorship deals. Tubridy's arrival coincided with a marked increase in audience ratings, with some early statistics comparing him to the Byrne era. Patrick Kielty is the current presenter, having succeeded Tubridy in September 2023.