Girls' Generation-TTS (소녀시대-태티서, also known as TTS, TaeTiSeo, or Girls' Generation-TaeTiSeo) was a sub-unit of the girl group Girls' Generation, formed by S.M. Entertainment in 2012.
- Taeyeon (태연) - Main Vocalist, Lead Dancer, Lead Rapper, Visual and Center
- Tiffany (티파니) - Lead Vocalist and Main Rapper
- Seohyun (서현) - Leader, Lead Vocalist, Main Dancer, Maknae
- Dear Santa (2015)