斯基台人（古希腊语：Σκύθης或Σκύθοι，英语：Scythians）也译为斯基泰人、西古提人、叔提雅人、西徐亚人或塞西亚人，希腊古典时代在欧洲东北部、东欧大草原至中亚一带居住与活动的游牧民族，他们的领土被称为斯基提亚；古代波斯人称之为塞克人（古波斯语：Sakā，也译为萨迦人），分为戴尖帽塞克人、饮豪麻汁塞克人、海边塞克人。 中国《史记》、《汉书》记录的塞种可能源自这个民族，是哈萨克草原上印欧语系东伊朗语族之游牧民族，其随居地从今日俄罗斯平原一直到河套地区和鄂尔多斯沙漠，是史载最早之游牧民族。

The Scythians (/ˈsɪθi.ən/ or /ˈsɪði.ən/; from Greek Σκύθης, Σκύθοι), also known as Scyth, Saka, Sakae, Sacae, Sai, Iskuzai, or Askuzai, were a large group of Iranian Eurasian nomads who were mentioned by the literate peoples surrounding them as inhabiting large areas in the central Eurasian steppes from about the 9th century BC until about the 1st century BC. The Scythian languages belonged to the Eastern branch of the Iranian languages. The "classical Scythians" known to ancient Greek historians were located in the northern Black Sea and fore-Caucasus region. Other Scythian groups documented by Assyrian, Achaemenid and Chinese sources show that they also existed in Central Asia, where they were referred to as the Iskuzai/Askuzai, Saka (Old Persian: Sakā; New Persian: ساکا; Greek: Σάκαι; Armenian: սկյութները; Latin: Sacae, Sanskrit: शक Śaka), and Sai (Chinese:塞; Old Chinese: *sˤək), respectively.