English proficiency is an important component of a thriving and modern society. This study explored the levels of grammar and vocabulary skills in relation to the speaking abilities of maritime students. This study was conducted in one of the higher education institutions in Ozamiz City. The descriptive-correlational research design was used. One hundred twenty students served as the respondents of the study. They were chosen through stratified random sampling. The researcher-made tests used in gathering the data were the Grammar Skills Test, Vocabulary Skills Test, and Speaking Abilities Test. In addition, Frequency, Percentage, Mean and Standard Deviation, and Pearson Product-Moment Correlation Coefficient were used in analysing the data gathered. The results revealed that the levels of the students' grammar skills and speaking abilities were very satisfactory. On the other hand, the students' vocabulary skills were satisfactory. Furthermore, the students’ grammar and vocabulary skills do not correlate with each other. The study concludes that the students have performed well in grammar, are good at vocabulary, and are proficient in speaking. In addition, their grammar and vocabulary skills do not greatly impact how they deliver their speaking abilities. It is recommended that the teachers develop learning strategies to improve their proficiency and promote the development of grammar, vocabulary, and speaking abilities.