At the Multi Commodity Exchange (MCX), the March contract declined by Rs 8.50, or 0.67%, to Rs 1,248.90 per kg in 172 lots.
Profit-booking by speculators after recent gains and a weak industrial demand in the spot market affected the trade.
Besides, weak demand from pharmaceutical industries, amid higher arrivals from Chandausi in Uttar Pradesh, also weighed on mentha futures trade.