The Justice Ministry said Abbas Gallyamov "distributed materials created by foreign agents to an unlimited circle of people, spoke out against the special military operation in Ukraine, (and) participated as an expert and respondent on information platforms provided by foreign structures."
Russia has added several prominent figures to its foreign agents registry.
Gallyamov, who wrote speeches for Putin during his 2008-12 stint as prime minister, is frequently quoted by foreign media. He recently attracted attention with an appearance on CNN in which he suggested Putin could face a military coup.
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The ministry said it also put pop star Zemfira Ramazanova, who performs using only her first name, on the list. She had publicly opposed Russia's military actions in Ukraine and received unspecified foreign funds, the ministry said.
Dmitry Gudkov, who was a well-known opposition politician before fleeing Russia in 2021, was also designated a foreign agent.