One Hundred and Seven Martyrs of England and Wales, also known as Thomas Hemerford and One Hundred and Six Companion Martyrs, are a group of clergy and laypersons who were executed on charges of treason and related offences in the Kingdom of England between 1541 and 1680.

They are considered martyrs in the Roman Catholic Church and were beatified on 15 December 1929 by Pope Pius XI.

[1] Diocesan Clergy Roman Catholic Laity Society of Jesus (Jesuits) Order of Saint Benedict (Benedictines) Order of Minims (Minims) Knights of Saint John of Jerusalem In England these martyrs, together with those beatified between 1886 and 1929, are commemorated by a feast day on 4 May.

This day also honours the Forty Martyrs of England and Wales who hold the rank of saint; the Forty Martyrs were honoured separately on 25 October until the liturgical calendar for England was revised in the year 2000.

Three of the martyrs named in this group of 107 – William Gunter, Edward Jones, and Philip Powell – have Welsh connections.