Miguel Fisac Serna (1913–2006) was a Spanish architect, urban planner, and painter.

[1][2] He was a member of Opus Dei from 1935 to 1955,[3] but later publicly criticized that organization as well as the character of its founder, Mons.

[5] He had six brothers and sisters, among them Dolores 'Lola' Fisac (1909-2005), who became one of the first female Opus Dei members.

He was member of Catholic organization Opus Dei from 1935 till 1955, when he left.

[3][1] He fled to France during the Civil War along with Opus Dei founder Josemaría Escrivá and a group of other members.