Which language families have linguists proposed as possible relatives of Korean?

Linguists have proposed several hypotheses regarding the genetic relationships of the Korean language, though none have achieved universal consensus.12

The most frequently discussed proposals include:

• Altaic Languages: Many scholars have explored a connection between Korean and the Altaic languages—a group typically comprising Turkic, Mongolic, and Manchu-Tungus languages. While some researchers argue this relationship is proved based on structural and vocabulary similarities, most modern linguists reject the broader Altaic hypothesis, often viewing the observed commonalities as the result of long-term geographic proximity rather than a shared genetic origin.23
• Japanese: A genetic relationship between Korean and Japanese has been posited by various linguists. While some scholars continue to advocate for this link, others maintain that the similarities between the two languages are better explained by language contact and borrowing over time.14
• Other Proposals: Historically, researchers have attempted to link Korean to a variety of other language families, including Dravidian, though these claims remain largely unproven and speculative due to the limitations of traditional comparative linguistic methods when applied to such deep time depths.5

Ultimately, the classification of Korean remains a subject of ongoing scholarly debate, with many experts regarding it as a language isolate or noting that evidence for its external relationships remains insufficient.26