The prisoner, Ghennadii Vartic, a Moldovan national who is currently serving a 25-year prison sentence in Romania, complained that during detentions in 1998 and 2009, prison authorities would not provide him with a vegetarian diet as required by his Buddhist convictions.
The Strasbourg-based European Court of Human Rights condemned Bucharest to pay the 40-year-old 3,000 euros (USD 4,130) in damages and 200 euros for costs and expenses for violating his freedom of religion.
Bucharest which has three months to appeal argued that a number of prisoners convert to religion to receive better food.
However the court ruled there was no proof that this was true in Vartic's case.