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TaeTiSeo is a subgroup of South Korean girl group Girls' Generation, formed by S.M. Entertainment in 2012. It is composed of three Girls' Generation members: Taeyeon, Tiffany, and Seohyun. The group released their debut album, Twinkle, in 2012 and released a second one, Holler, in 2014.

On April 19, 2012, S.M. Entertainment officially announced the formation of the subgroup, stating in their official press release that the intention was to "grab the attention of fans with all aspects of music, performance, and fashion styles." It also hinted at the possibility of other future subgroups, elaborating, "the members of the unit are rotated according to the unique music and concept of each new subgroup album." The name "TaeTiSeo", or "TTS", is made up of the first syllables of Taeyeon, Tiffany, and Seohyun. Compared to the 8-member Girls' Generation, TTS's main focus is on each member's vocal ability while the original group places more emphasis on the overall songs and uniform group performances.

In 2014, the three singers were featured in the reality show The TaeTiSeo. The show took on the personal side of Taeyeon, Tiffany and Seohyun, revealing how they live their normal everyday lives and what they do in their free time. Some footage of the album preparation was shown.
As both Tiffany and Seohyun left SM Entertainment in 2017, the subunit is effectively disbanded.

Members & Songs

• Kim Tae-yeon 11485
• Stephanie Young Hwang 11314
• Seohyun 7164
• Twinkle 61
• Holler (Album) 47
• Taetiseo Holler Showcase 26
• Dear Santa 16
• Adrenaline 15
• The Taetiseo 4
• Goodbye Hello 1

Aliases

• Girls Generation - Taetiseo
• Girls Generation - Tts
• Sonyeo Sidae-taetiseo
• Sonyeo Sidae-tts