"Foundational Mathematics for Tertiary Institutions" is the culmination of the authors' classroom experiences gathered over the years. It covers the essential basics of Mathematics needed at the initial level of study in Tertiary Institutions. The textbook is intended for students, teachers, and researchers in mathematical sciences, engineering, and technology, who will find it valuable for both classroom work and as a reference manual. The concepts of the topics covered are presented in a simplified manner, accompanied by a carefully selected wealth of examples and exercises.