This paper delves into the ethical codes that psychologists must adhere to, emphasizing their role in promoting personal and social well-being, and resolving ethical conflicts. The paper examines the application of these codes within Singapore's multicultural environment, highlighting the importance of APA and BPS ethics in a psychologist's career. It explores ethical decision-making models, such as Cornell's eight-step model, and emphasizes the need for psychologists to involve clients in the decision-making process, respecting their autonomy and providing adequate information. The paper analyzes ethical dilemmas, including homosexuality and marriage, using an ethical decision-making model. It examines the complexities of these issues within a societal context, legal frameworks, and the importance of consulting with colleagues. The paper also discusses the implications of various courses of action, emphasizing the need for psychologists to respect cultural differences and maintain ethical principles to foster harmony within the diverse cultures of Singapore.