Boikos (Ukrainian: Boiky) are an ethnographic group of Ukrainian highlanders who inhabit both slopes of the middle Carpathian Mountains; their lands are split between in Lviv, Ivano-Frankivsk and Transcarpathia (Zakarpattia) oblasts. 

The Boikos are believed to be the descendants of the ancient Slavic tribe of White Croatians that came under the rule of the Kyivan Rus’ state during the reign of Grand Prince Volodymyr the Great. Before the Magyars occupied the Danube Lowland this tribe served as a direct link between the Eastern and Southern Slavs.

The name "Boiko" is thought by some to originate in their patterns of speech, specifically the use of the affirmative exclamation "bo-ye!", meaning the only or because it is so. Example: "Nu, bo vono tak i ye" ("This is the way it is”). In modern Ukrainian language, the word bo is not common and considered to be an archaism, yielding to its alternative ale.  Sometimes the Boikos reject their name, regarding it as derogatory, and call themselves highlanders (verkhovyntsi). In Transcarpathia the name Boiko is rarely used.

Most Boikos belong to the Ukrainian Greek Catholic Church, with a minority belonging to the Ukrainian Orthodox Church. The distinctive wooden church architecture of the Boiko region is a three-domed church, with the domes arranged in one line, and the middle dome slightly larger than the others.

There have been a number of writers who were born in the Boiko region or wrote about it;  Ivan Franko is the best-known writer from this region. In some literary works  the peculiarities of the Boiko dialect are preserved, particularly in the works of Kmit, Markiv, Zubrytsky, and Parfanovych.