We depend on the sea, economically, social well-being, and for the quality of our lives, yet direct and indirect human activities have affected the marine environment, causing many problems such as overfishing and pollution at the local scale and ocean warming and acidification at the global one. Hence, addressing the cumulative effects of these activities is required to conserve the marine environment for our current and future generations. Social commitment and support for these actions depend, however, on awareness and requires, therefore, an understanding of citizens’ awareness and perceptions on these issues. We assessed the awareness and the perceptions of Saudi citizens on ocean issues through an online questionnaire about environmental issues globally and in the country. The survey was completed by 1,524 Saudi citizens 18 years old and above, with different geographic distributions, gender, and educational status. The participants identified climate change within the top three global problems, with variable level of information and trust on different sources of environmental information. Littering, sewage pollution, and chemical pollution were identified as the top three major marine issues in Saudi Arabia, with the respondents demanding an immediate action through imposing fines to polluters and more regulatory constraints to activities that act as sources of pollution as well as supporting research in science and technologies to address these environmental issues.