斯基泰人(Scythians)，又譯西古提人、西徐亞人或賽西亞人；古代波斯人稱之為 Saka 塞人，分為戴尖帽塞人、飲豪麻汁塞人、海那邊的塞人；中國《史記》、《漢書》稱之為塞、尖帽塞人或薩迦人，是南俄草原上印歐語東伊朗語族之遊牧民族，其隨居地從今日俄羅斯東部的歐洲部分一直到內蒙古和鄂爾多斯沙漠，是史載最早之遊牧民族，善於養馬，信騎與奶酪等皆
出於其明；公元前7世紀曾對高加索、小亞細亞、亞美尼亞、米底以及亞述帝國大舉入侵，威脅西亞近七十年，其騎兵馳騁於卡帕多細亞到米底、高加索到敘利亞之間，尋找掠奪物；其逐漸衰落，分為衆多部落，公元四、五世紀民族大遷徙時隨匈奴入侵歐洲之阿蘭人即為其中之一部。有人說在海以北戴尖帽那支來成為突厥阿史那部
斯基泰人沒有文字。
The Scythians or Scyths (Greek: Σκύθης, Σκύθοι) were an Ancient Iranian people of horse-riding nomadic pastoralists who throughout Classical Antiquity dominated the Pontic-Caspian steppe, known at the time as Scythia. By Late Antiquity the closely-related Sarmatians came to dominate the Scyths in this area. Much of the surviving information about the Scyths comes from the Greek historian Herodotus (c. 440 BC) in his Histories, and archaeologically from the exquisite goldwork found in Scythian burial mounds in Ukraine and Southern Russia.
The name "Scythian" has also been used to refer to various peoples seen as similar to the Scythians, or who lived anywhere in a vast area covering present-day Ukraine, Russia and Central Asia—known until medieval times as Scythia.