"Exercises in Functional Analysis" is a comprehensive textbook aimed at mathematics students, offering over 450 exercises in functional analysis. The exercises are designed to enhance the understanding of fundamental concepts and results typically covered in an introductory course on functional analysis. This book aims to improve readers' skills in handling mathematical calculations while also highlighting the diversity of ideas and techniques that functional analysis offers. The exercises vary in difficulty and cover various topics, making it a valuable tool for both students and educators. Readers are encouraged to assess the effectiveness of the exercises themselves and discover how they can be applied in practice.