The health and social development ministry's quota comes into force April 29, and applies to every team from football's Russian Premier League to hockey's KHL to basketball's VTB League.
The decree was published Wednesday in the government newspaper Rossiiskaya Gazeta.
"Foreign athletes in Russian teams must be no greater than 25 percent of the overall number of employees, including masseurs, chefs, admin and other technical personnel," the newspaper said.
"This rule applies to all categories, from regional teams to the highest leagues."
The budgets of football, basketball and volleyball teams are "eaten up" by foreign coaches and players, it said.
The rule does not appear to threaten the make-up of most of Russia's top clubs, which tend to employ many more Russians than foreigners
The quota found support in the All-Russian Volleyball Federation, whose chief said it was critical not to impede the development of young talent.
"I support the new regulations," said Stanislav Shevchenko.
"In my opinion, Russian athletes should play in our teams, and the foreigners who play should be of the top level only. Our organization already maintains the foreigner quota at an even lower level than 25 percent, though many insist on its expansion."
In football, the decree will act alongside existing regulations that limit the number of foreigners on the field of play at one time to five.
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