Khachen (Armenian: Խաչեն) or Seyidbeyli (Azerbaijani: Seyidbəyli) is a village in the Khojaly District of Azerbaijan. The village has an ethnic Armenian-majority population, and also had an Armenian majority in 1989. It was under the de facto control of breakaway Republic of Artsakh until the Azerbaijani offensive in the region in 2023.

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.

• 
  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