在音乐理论上，属七和弦（dominant seventh chord），又可称：大小七和弦（major minor seventh chord）是一组由根音，大三度，纯五度，和小七度构成的和弦。也可以被看作是一个大三和弦（或曰“大调三和弦”附加一个小七度音。在流行音乐的标记符号体系中，其标示方法是：在一个标示和弦根音的字母之后，上标数字“7”。

In music theory, a dominant seventh chord, or major minor seventh chord, is a chord composed of a root, major third, perfect fifth, and minor seventh. It can be also viewed as a major triad with an additional minor seventh. When using popular-music symbols, it is denoted by adding a superscript "7" after the letter designating the chord root. The dominant seventh is found almost as often as the dominant triad. In Roman numerals it is represented as V. The chord can be represented by the integer notation {0, 4, 7, 10}.