LY or ly may refer to:
Lyme disease, also known as Lyme borreliosis, is an infectious disease caused by bacteria of the Borrelia type.
Lyon or Lyons (UK /liːˈɒn/ or /ˈliːɒn/; French pronunciation: [ljɔ̃], locally: [lijɔ̃]; Arpitan: Liyon [ʎjɔ̃]) is a city in east-central France, in the Auvergne-Rhône-Alpes region, about 470 km (292 mi) from Paris and 320 km (199 mi) from Marseille.
Lymphoma is a group of blood cell tumors that develop from lymphocytes (a type of white blood cell). The name often refers to just the cancerous ones rather than all such tumors.
Lynyrd Skynyrd (pronounced /ˌlɛnərd ˈskɪnərd/ LEN-ərd-SKIN-ərd) is an American rock band best known for popularizing the Southern rock genre during the 1970s.
The lymphatic system is part of the circulatory system and a vital part of the immune system, comprising a network of lymphatic vessels that carry a clear fluid called lymph (from Latin, lympha meaning "water") directionally towards the heart.
Lynching is an extrajudicial punishment by an informal group. It is most often used to characterise informal public executions by a mob in order to punish an alleged transgressor, or to intimidate a group.