Pilar Sueiro was born in Vigo where she attended high school and then went on to study Business Management. From an early age she was drawn to the stage. She started as an actress in independent theater in Galicia and later moved on to cinema in which she soon had leading roles in a large number of short films.
In 1982, in Galicia, she set up the production company PS Films (Pilar Sueiro Films), with which she produced 19 short films on 35mm. She wrote and directed two of these, the documentaries "Vicus Spacorum" (1982) and "Retazos gallegos" (Galician Remains) (1983). During this time, she worked as an actress in the following short films: "Opus I Homo Hominis", "Augurio" (Omen), "Virginal" (Virginal), "Vestida de fiesta" (Dressed Up for A Party), "Una historia gallega" (A Galician Story), "Cien puntos para Julián Pintos" (One Hundred Point for Julián Pintos), "La tercera mujer" (The Third Woman), "Añoranzas" (Yearnings for the Past), "Juego decisivo" (A Decisive Game), "Mujer, mujer" (Woman, Woman), "Carmín" (Red) and "Muñeca de azul" (Blue Doll), written and directed by Juan Pinzás.
In 1984, along with Pinzás, she set up the production company Atlántico Films, S.A. and took on the functions of executive producer.
In the following years Pilar Sueiro produced the feature films "La gran comedia" (The Great Comedy) (1985-86), in which she also worked as an actress along with Luis Escobar, José Luis López Vázquez and Rosalía Dans; "El juego de los mensajes invisibles" (The Game of the Invisible Messages) (1991), based on the novel "El hijo adpotivo", by Álvaro Pombo, with a script by Pinzás and Pombo; "La leyenda de la doncella" (The Legend of the Maiden) (1995).
In 1998, Pilar Sueiro made her first film as a director with her own script, "Cuando el mundo se acabe, te seguiré amando" (I'll still love you, when the world ends), a romantic film, not without an acidic touch, that made her the first Galician female feature film director. This film has been selected for festivals in Toulouse, Miami, Lorca, Seville, Costa Rica and Turin. It is considered by a large number of critics as «a beautiful game of fantasy and reality, of art and mundane reality, where feelings become complicated until they culminate in an emotive ending». The maestro Luis García-Berlanga supported this film in which he has a notable cameo role playing himself.
In the next years Pilar Sueiro produced "Era outra vez" (Once Upon Another Time) (2000), the first Dogma film in Spanish cinema with the Official Certificate from Lars von Trier; "Días de boda" (Wedding Days) (2002), the second Spanish Dogma film with the Official Certificate; and “El desenlace” (The Outcome) (2005), which closed the official Dogma trilogy of Spanish cinema and, like the two previous films, obtained the Official Certificate from Lars von Trier. All these feature films produced by Pilar Sueiro for Atlántico Films, with script and direction by Juan Pinzás, had a notable impact at international festivals and won important awards.
In 2009, Pilar Sueiro produced the feature length documentary “Las imágenes perdidas. La otra mirada” (The Lost Images. The Other View), directed by Juan Pinzás.
At present, Sueiro is preparing as producer three news feature films, “El tiempo del abismo” (The Time of the Abyss), “La sombra de Nueva York” (The Shadow of New York) and “Néboa” (Fog).