至今產量最多的超音速飛機，蘇聯米高揚·格列維奇設計局研製，戰機界的AK-47，與美國F-4戰機一較高下，米格-21戰鬥機「魚床」「三角琴」「鉛筆」

米格-21戰鬥機（俄語：Микоян и Гуревич МиГ-21）是蘇聯米高揚·格列維奇設計局於1950年代初期研製的一種單座單發輕型超音速的第二代戰鬥機。北約代號為魚床／魚窩（Fishbed）。蘇聯飛行員給它的外號是「三角琴」、波蘭人則稱它為「鉛筆」。米格-21（包含仿製、改良型）可能是至今產量最多的超音速飛機，越南戰爭是它最廣為人知的戰場，曾與美國人的F-4戰機一較高下；在中東地區跟以色列也是頻頻交手，其他如南北葉門戰爭、印巴戰爭也看得到米格-21的蹤影。至今仍然有不少米格-21活躍在世界上，並有許多現代化升級套裝，若加強雷達搜索和掛載新型長程飛彈後仍能一戰，故被戲稱是戰機界的AK-47。
The Mikoyan-Gurevich MiG-21 (Russian: Микоян и Гуревич МиГ-21; NATO reporting name: Fishbed) is a supersonic jet fighter and interceptor aircraft, designed by the Mikoyan-Gurevich Design Bureau in the Soviet Union. Its nicknames include: "balalaika", because its planform resembles the stringed musical instrument of the same name; "Ołówek", Polish for "pencil", due to the shape of its fuselage, and "Én Bạc", meaning "silver swallow", in Vietnamese.Approximately 60 countries across four continents have flown the MiG-21, and it still serves many nations six decades after its maiden flight. It made aviation records, becoming the most-produced supersonic jet aircraft in aviation history, the most-produced combat aircraft since the Korean War and, previously, the longest production run of any combat aircraft (now exceeded by both the McDonnell Douglas F-15 Eagle and General Dynamics F-16 Fighting Falcon).