里德伯公式（又称里德伯-里兹公式）是1889年瑞典物理学家里德伯提出的表示氢原子谱线的经验公式。

其中R=4/B，称为里德伯常量，λ是谱线的波长。

里德伯公式是比巴耳末公式更加普遍地表示氢原子谱线的公式。巴耳末公式是里德伯公式在n=2的条件下的特例。里德伯公式中，对于每一个n都有n'=n+1,n+2,n+3…每种n和n'的组合都代表一条谱线。例如n=2、n'=3是波长为6563Å的H_α线，n=2、n'=4是波长为4861Å的H_β线。对于每一组n相同，n'不同的无穷条谱线，都构成一个线系。每个线系的第一条谱线波长最长，是n'=n+1向n的状态跃迁产生的谱线。随着n'不断增大，谱线的波长越来越短，谱线之间波长的间隔越来越小，当n'=∞时，线系终止于

The Rydberg formula is used in atomic physics to describe the wavelengths of spectral lines of many chemical elements. It was formulated by the Swedish physicist Johannes Rydberg, and presented on 5 November 1888.

In 1880, Rydberg worked on a formula describing the relation between the wavelengths in spectral lines of alkali metals. He noticed that lines came in series and he found that he could simplify his calculations by using the wavenumber (the number of waves occupying the unit length, equal to 1/λ, the inverse of the wavelength) as his unit of measurement. He plotted the wavenumbers (n) of successive lines in each series against consecutive integers which represented the order of the lines in that particular series. Finding that the resulting curves were similarly shaped, he sought a single function which could generate all of them, when appropriate constants were inserted.