Russian orthography has been reformed officially and unofficially by changing the Russian alphabet and spelling rules over the course of the history of the Russian language. Several important reforms happened in the 18th–20th centuries.

Old East Slavic adopted the Cyrillic script, approximately during the 10th century and at about the same time as the introduction of Eastern Christianity into the territories inhabited by the Eastern Slavs. No distinction was drawn between the vernacular language and the liturgical, though the latter was based on South Slavic rather than Eastern Slavic norms. As the language evolved, several letters, notably the yuses (Ѫ, Ѭ, Ѧ, Ѩ) were gradually and unsystematically discarded from both secular and church usage over the next centuries.

The emergence of the centralized Russian state in the 15th and 16th centuries, the consequent rise of the state bureaucracy along with the development of the common economic, political and cultural space necessitated the standardization of the language used in administrative and legal affairs. It was due to that reason that the earliest attempts at standardizing Russian, both in terms of the vocabulary and in terms of the orthography, were made initially based on the so-called Moscow chancery language. From then and on the underlying logic of language reforms in Russia reflected primarily the considerations of standardizing and streamlining language norms and rules in order to ensure the language's role as a practical tool of communication and administration.

The printed Russian alphabet began to assume its modern shape when Peter I introduced his "civil script" (гражданский шрифт) type reform in 1708. The reform was not specifically orthographic in nature. However, with the replacement of Ѧ with Я and the effective elimination of several letters (Ѯ, Ѱ, Ѡ) and all diacritics and accents (with the exception of й) from secular usage and the use of Arabic numerals instead of Cyrillic numerals there appeared for the first time a visual distinction between Russian and Church Slavonic writing. With the strength of the historic tradition diminishing, Russian spelling in the 18th century became rather inconsistent, both in practice and in theory, as Mikhail Lomonosov advocated a morphophonemic orthography and Vasily Trediakovsky a phonemic one.

Throughout the 18th and 19th centuries, miscellaneous adjustments were made ad hoc, as the Russian literary language came to assume its modern and highly standardized form. These included:

By 1917, the only two words still spelled with ѵ in common use were мѵро (müro, [ˈmʲirə], 'chrism') and сѵнодъ (sünod, [sʲɪˈnot], 'synod'). The ѳ remained more common, though it became quite rare as a "Western" (French-like) pronunciation had been adopted for many words; for example, ѳеатръ (ḟeatr, [fʲɪˈatr], 'theater') became театръ (teatr, [tʲɪˈatr]).

Attempts to reduce spelling inconsistency culminated in the 1885 standard textbook of Yakov Karlovich Grot, which retained its authority through 21 editions until the Russian Revolution of 1917. His fusion of the morphological, phonetic, and historic principles of Russian orthography remains valid to this day, though both the Russian alphabet and the writing of many individual words have been altered through a complicated but extremely consistent system of spelling rules that tell which of two vowels to use under all conditions.

The most recent major reform of Russian spelling was prepared by Aleksey Shakhmatov and implemented shortly after the Bolshevik revolution of November 1917.