John Knox has been known as a Reformer of Scotland and studies on him have been mainly carried out in relation to John Calvin. Although there is no literal mention of ‘mission’ in his works, we can find that missiological concepts are abundant in his articles and letters. Firstly, the Scots Confession, which was drawn up under his influence in 1560, has an obvious missionary purpose. The preface and last sentence of the Scots Confession is to bear witness to the Gospel into all the nations. Secondly, Knox’s ecclesiology resembles that of John Calvin, with its particular emphasis on ‘ecclesiastical discipline’ for witnessing the Gospel. For him, the Church, which God raises up and fosters for His own purpose, is universal and ecumenical; the state, on the other hand, only exists as a means to protect and propagate the Gospel of Jesus Christ. Therefore, he advocates a theocracy in order to establish a ‘universal Christian fellowship’ within Scotland. He also advocates social reform and stresses the need for universal compulsory education including girls’ education. Finally, he strived to return the Bible back to the ordinary people from the ecclesiastical authorities, urged people to read the Bible everyday and do group study at least twice a week. This was to kindle a fire of the Gospel in Scotland. In this aspect, he should be called a ‘Scottish Reformer’ rather than a Reformer of Scotland. He was truly an ‘inland missionary of Scotland’.