Seaweeds are the ocean's living resources, rich in diverse compounds like lipids, proteins, carbohydrates, phytohormones, amino acids, osmoprotectants, antimicrobial compounds and minerals. Their potential for agricultural applications is used since antiquity, but recent demands of organic farming and organic food stimulated much the application of organic treatments like seaweed extracts in agriculture.The seaweed and its products are extensively used in crops cultivation to enhance production systems due to many plant-growth-promoting compounds present in seaweeds and play a key role in the rising demand for organic food. Seaweeds and their associated compounds can support the onset of seed germination and plant root growth, which applies to temperature, resistance to abiotic stress, and improves plants’ ability to absorb nutrients. Introducing organic fertilizer in modern cultivation activities tends to strengthen soil stability, and it would be an environmentally friendly approach. The principal focus of this review is to highlight the inference of marine seaweeds as biofertilizer.