Corporate social responsibility (CSR) of businesses is getting augmented concentration in recent years and the business leaders have emphasized that the organizations should operate in a socially responsible manner to ensure long term sustainability and economic viability. Internationally, CSR has been evolving from ‘one-off feel good projects’ and cash donations into something that is vital to the uniqueness and the core activities of the company. Consequently, the CSR of businesses has become asignificant part of today’s business agenda. ISO 26000 provides guidance on how businesses can operate in a socially responsible way. The paper aims to investigate the CSR practices at Grameenphone inconsistent with the 7 core principles of ISO 26000 in Bangladeshand also identify different CSR activities of GP. There are some major benefits of following the international standard on CSR; GP has been enjoying that privilege as its CSR activities are mostly consistent with ISO 26000.This study has been conducted based on the Secondary data. It can be concluded Grameenphone has believed since its inception thatsustainable business success and stakeholder’s value cannot be achieved solelythrough maximizing short term profits, but through sociallyresponsible activities of the business.