WALCOM is an initialism for Workshop on Algorithms and Computation. It is an annual conference series on all aspects of algorithms and computation. Since its inception in 2007, it has been being held as a yearly event. WALCOM has grown substantially in reputation and has been able to attract researchers and scientists around the globe. Walcom has established itself as a fully refereed conference for theoretical computer science research in Asia. It has also strengthened the ties between local and international scientific communities. The first Workshop on Algorithms and Computation (WALCOM 2007) was held on February 12, 2007 in Dhaka, Bangladesh and was organized by Bangladesh Academy of Sciences. WALCOM 2008, WALCOM 2010, WALCOM 2012, WALCOM 2015 and WALCOM 2018 were held in Bangladesh; whereas WALCOM 2009, WALCOM 2011, WALCOM 2013, WALCOM 2014 and WALCOM 2019 were held in India. WALCOM 2016 was held in Nepal, WALCOM 2017 was held in Taiwan and WALCOM 2020 was held in Singapore. The name of this conference has been changed as Conference and Workshops on Algorithms and Computation since WALCOM 2017. The 15th International Conference and Workshops on Algorithms and Computation (WALCOM 2021) will be held in University of Information Technology, Yangon, Myanmar during February 28 - March 02, 2021.