Niilo Antti Johannes Yli-Vainio (February 23, 1920 in Alahärmä - November 16, 1981 in Spain) was a Finnish Christian Charismatic leader.

He started preaching after having recovered from a heart condition during the 1950s and rose to fame during the late 1970s.

Several alleged healing miracles and other spiritual experiences took place at his revival meetings.

He returned to Finland and started holding large Christian meetings where he spoke of the message of God's love, forgiveness and the life-changing effect of personal faith.

The film was named White Butterfly (Valkoinen Yoperhonen) and included an interview with his daughter Aino.