YY or variants may refer to:
YY1 (Yin Yang 1) is a transcriptional repressor protein in humans that is encoded by the YY1 gene.
"YYZ" (pronounced "Why-Why-Zed") is an instrumental rock composition by Canadian rock band Rush, from their 1981 album Moving Pictures.
Yyrkoon is a French death metal band. The main lyrical themes revolve around occultism, horror/fantasy, and members' personal philosophies.
YY (Chinese: YY语音) is a major Chinese video-based social network with over 300 million users. It features a virtual currency which users earn through activities such as karaoke or creating tutorial videos and which is later converted to real cash.
The yybP-ykoY leader RNA element was originally discovered in E. coli during a large scale screen and was named SraF.
YYOGA is a yoga, fitness, and wellness company based in Vancouver, British Columbia. It is the largest corporately-owned yoga company in Canada.
ISO 8601 Data elements and interchange formats – Information interchange – Representation of dates and times is an international standard covering the exchange of date- and time-related data.
Yyldyz Hotel (Turkmen: Ýyldyz oteli) is a luxury hotel located in Ashgabat, Turkmenistan. Built in 2013 by Bouygues, it has 155 rooms.