DCV can mean: 605 (DCV in Roman numerals), a common year starting on Friday of the Julian calendar 605 (number), a harshad number in Roman numerals Basque Christian Democracy (Democracia Cristiana Vasca), a Basque Country Christian-democratic party DCV, a a generic ship prefix for deepwater construction vessels Demand controlled ventilation, a feedback control method to maintain indoor air quality Directional control valve, one of the most fundamental parts of hydraulic and pneumatic systems Drosophila C virus, a viral disease of the genus Cripavirus