"One Night Love Affair" is a song by Canadian singer and songwriter Bryan Adams. The song was written by Adams and Jim Vallance for Adams's fourth studio album Reckless (1984). It was the fifth single released from the album. It is one of Adams's most recognizable and popular songs in North America. The song peaked #13 on the Billboard Hot 100 and #7 on the Top Rock Tracks chart. The song has appeared on Adams's compilation album Anthology (2005). It was the only single taken from Reckless with no music video, among the six that were officially released between 1984 and 1986.

The song is about a one-night stand. The lyrics describe the encounter and the subsequent parting of ways of the protagonists, who, the song suggests, are concealing deeper feelings.

Although "One Night Love Affair" was officially released to US radio in 1985, it appeared on the Billboard magazine's Hot 100 chart at 13 and 7 on the mainstream rock tracks. In Canada, "One Night Love Affair" was officially released to radio in February 1985. The song reached the top twenty on the Canadian Singles Chart and remained in the top twenty for another month. "One Night Love Affair" was the lowest charting single from Reckless (1984).

According to Vallance, when the song was first played to Adams' guitarist Keith Scott, Adams and Vallance replaced the line "if the night was made for love, it ain't for keeps" with the line "if the night was made for love, it ain't for Keith". Scott found this very funny, and whenever Adams plays the song live, he looks at Scott and sings the "Keith" lyric.

"One Night Love Affair" appeared on the soundtrack of the sci-fi comedy film Real Genius (1985) starred by Val Kilmer. The song was used during the scene where the Pacific Tech students attend the Tanning Invitational pool party with the beauty school students.

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