Khachen (Armenian: Խաչեն) or Seyidbeyli (Azerbaijani: Seyidbəyli) is a village in the Khojaly District of Azerbaijan, in the region of Nagorno-Karabakh. Until 2023 it was controlled by the breakaway Republic of Artsakh. The village had an ethnic Armenian-majority population until the exodus of the Armenian population of Nagorno-Karabakh following the 2023 Azerbaijani offensive in Nagorno-Karabakh.

The village was known as Seyidishen (Russian: Сеидишен) during the Soviet period.

During the Soviet period, the village was a part of the Askeran District of the Nagorno-Karabakh Autonomous Oblast.

Historical heritage sites in and around the village include the 12th/13th-century Kachaghakaberd Fortress in the mountains to the west, a 12th/13th-century khachkar, the 13th-century St. Stephen's Church (Armenian: Սուրբ Ստեփանոս եկեղեցի, romanized: Surb Stepanos Yekeghetsi), the 13th/14th-century monastery of Ptkes Berk (Armenian: Պտկես բերք), an 18th-century village, and the 19th-century St. John's Church (Armenian: Սուրբ Հովհաննես եկեղեցի, romanized: Surb Hovhannes Yekeghetsi).

The population is mainly engaged in agriculture and animal husbandry. As of 2015, the village has a municipal building, a house of culture, a secondary school, a kindergarten and a medical centre. The community of Khachen includes the village of Urakhach.

The village had 369 inhabitants in 2005, and 332 inhabitants in 2015.

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  Mountains near Khachen
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  The Khachenaget river which demarcates the boundary between the provinces of Askeran and Martakert

• Khachen, Nagorno-Karabakh at GEOnet Names Server
• A short documentary about the village on YouTube