The decision comes just one day after Latvia expelled a Belarusian diplomat.
Last week, Belarusian police raided the home of a Latvian diplomat in Minsk, confiscating his possessions and accusing him of distributing pornography.
Latvia says the raid was a breach of the international conventions on the treatment of diplomatic staff.
RFE/RL Belarus, Ukraine, And Moldova Report
SUBSCRIBE For weekly news and analysis on Belarus, Ukraine, and Moldova by e-mail, subscribe to "RFE/RL Belarus, Ukraine, And Moldova Report."