The present investigation finds that Chondracanthus chamissoi seaweed abounding in Peruvian coasts is characterized by its nutritional composition, total polyphenols, antioxidant capacity, and functional properties such as water-holding capacity (WHC), oil-holding capacity (OHC), and swelling capacity (SC). Boiling and steaming were applied before dehydration to evaluate the effect of these thermal treatments, keeping a control sample. The results indicated that the control dried seaweed sample presented 20.2 +/- 0.16 g/100 g dw of proteins, 20.0 +/- 0.61 g/100 g dw of ash, and 56.6 +/- 0.08 g/100 g dw of total dietary fiber. In addition, the control sample presented 1.6 +/- 0.07 mg GAE/g of total polyphenol content and 2.4 +/- 0.30 mM Trolox mg/g of antioxidant capacity. In boiling samples, the apparent nutrient retention factors for proteins, fat, and dietary fiber are 96, 47 and 74%, respectively. In the steaming sample, the values were 102, 29, and 92%. The boiling before dehydration causes a significant decrease (p < 0.05) in total polyphenols and increases carbohydrates. Steaming before dehydration, a significant (p < 0.05) increase occurs in carbohydrates without significantly altering the concentration of total polyphenols. Regarding the functional properties, C. chamissoi presents 17.6 +/- 0.15 g/g of WHC, 2.4 +/- 0.78 g/g of OHC, and 9.8 +/- 0.75 mL/g of SC. Boiling produces an increase in WHC and OHC; steaming does not affect the properties of the control sample.C. chamissoi seaweed collected from the coasts of Peru is an excellent alternative for use as food and ingredients in processed foods for human consumption.