"Perfect Night" is a song recorded by South Korean girl group Le Sserafim, released on October 27, 2023, as the title track of their second extended play, Antifragile. The song was described as a hip hop, pop, and R&B track with lyrics about love and relationships. It was a commercial success, peaking at number two on South Korea's Circle Digital Chart and number 14 on the Billboard Japan Hot 100.

LE SSERAFIM's "Perfect Night" has surpassed 300 million streams on Spotify, setting a new record for the group. The track has also been certified platinum by the Recording Industry Association of Japan and has topped both the Billboard Japan and Melon weekly charts. In the United States, the song has spent 12 consecutive weeks on the Billboard chart and has also spent eight consecutive weeks on Spotify's Weekly Top Songs Global chart. "Perfect Night" has become LE SSERAFIM's career-high, peaking at their highest position ever on Spotify's Weekly Top Songs Global. Additionally, the song has spent two consecutive weeks on Billboard's Bubbling Under Hot 100 chart, marking LE SSERAFIM's own personal best.