This chapter examines the evolving dynamics of temperate seaweed markets, challenging the prevailing narrative of uniform sector growth. While demand for key temperate seaweed species continues to rise, the most recent production data reveals a concerning decline since 2020. This supply-demand imbalance has triggered significant price increases, particularly in food markets. The study analyzes market trends across multiple segments, finding that South Korean gim exports, biostimulants, and abalone feed have demonstrated robust growth rates between 2016 and 2023, while the alginates market grew more modestly. Production challenges for major species like Saccharina japonica in China and Pyropia yezoensis in Japan stem from climate change impacts, labor shortages, and breeding limitations. Meanwhile, Western markets face contrasting challenges with oversupply of certain species like Saccharina latissima but undersupply of others such as Palmaria palmata. The research identified four emerging trends: geographic diversification beyond Asia, increased onshore cultivation, a continued shift from wild harvesting to cultivation, and the rising importance of biostimulants as the second-largest seaweed market segment. These findings provide critical insights for industry stakeholders addressing cultivation and application challenges in global temperate seaweed markets.