Pascoe St Leger Grenfell was a British businessman and patron, and a key backer of the South Australian Company. He was a committee member of the South Australian Church Society, and is known for donation of an acre of land on North Terrace, Adelaide which was used for the construction of the Holy Trinity Church — one of the first churches built in the city and the colony. He also donated 40 acres of land for the use of the church as glebe lands. This land later became the suburb of Trinity Gardens. Grenfell Street, Adelaide was named after him.

Grenfell Street is a major street in the north-east quarter of the Adelaide city centre, South Australia. The street runs west-east from King William Street to East Terrace. Its intersection with Pulteney Street is formed by Hindmarsh Square. On the west side of King William Street, it continues as Currie Street towards West Terrace.