The present study highlights, distribution and diversity of twenty two marine algae species from the intertidal rocks at nine sampling stations along Valinokkam coast during six month period from January to June 2019. Among the different species of seaweeds, the dominant species Gracilaria corticata in all the sampling stations indicated it’s adaptability to the surf zone. Acanthophora spicifera and Caulerpa scalpeiliformis var. denticulata were the next two dominant species. The present study reveals that intertidal rocks occurring along the entire coast of Valinokkam offer suitable substratum for the luxuriant growth of seaweeds. The lack of anthropogenic activity along this coast favours for the good growth of different seaweeds.