德尔塔级是苏联建造的德尔塔I至IV级常温液体燃料弹道导弹核潜艇中的总称。如果将德尔塔I~IV算作一个级别，那德尔塔级是苏俄建造数量最多的弹道导弹核潜艇。德尔塔级属于苏联第二代弹道导弹核潜艇，由红宝石设计局设计。德尔塔4个级别的苏俄代号分别是667Б、667БД、667БДР以及667БДРМ。

由于德尔塔出现了4种外形相似，但又各有不同的艇型，这让北约为德尔塔级命名上遇上困难。在为德尔塔级命名上，北约武器系统命名小组将四个艇型统称为德尔塔（Delta）四个艇型则分别命名为德尔塔I级~德尔塔IV级，而苏联则将这四个艇型分为2个级别：667Б与667БД为同级，属于原型与改进型的关系，而667БДР与667БДРМ化为一个等级。德尔塔III和德尔塔IV都曾经试验发射潜射近地卫星运载火箭。德尔塔III级发射失败，而德尔塔IV级却取得成功。

The Delta class (Project 667B "Murena", Project 667BD "Murena-M", Project 667BDR "Kalmar", Project 667BDRM "Delfin") are a common name of four types of submarines which formed the backbone of the Soviet and Russian strategic submarine fleet since its introduction in 1973. They carry nuclear ballistic missiles of the R-29 Vysota family, with the Delta I, II, III and IV carrying the R-29 (NATO reporting name: SS-N-8 'Sawfly'), R-29D (SS-N-8 'Sawfly'), R-29R (SS-N-18 'Stingray') and R-29RM (SS-N-23 'Skiff') respectively. The Delta I carried 12 missiles, Delta II was a Delta I lengthened to carry 16 missiles; the Delta III and IV carry 16 missiles with multiple warheads and have improved electronics and noise reduction.