Richardson-Walsh will be appearing in her seventh Champions Trophy while Alex Danson and Laura Unsworth feature for the sixth time.
The men's competition begins on Friday; the women's event follows on 18 June.
Both are being staged at the Queen Elizabeth Olympic Park.
Women's Champions Trophy match schedule
GB squad: Giselle Ansley (Surbiton), Sophie Bray (East Grinstead), Crista Cullen (No club), Alex Danson (Reading), Maddie Hinch (Holcombe), Joie Leighn (Clifton), Kirsty Mackay (East Grinstead), Hannah Macleod (St Albans), Shona McCallin (Holcombe), Lily Owsley (University of Birmingham), Sam Quek (Holcombe), Helen Richardson-Walsh (Reading), Kate Richardson-Walsh (Reading), Susannah Townsend (Canterbury), Georgie Twigg (Surbiton), Laura Unsworth (East Grinstead), Hollie Webb (Surbiton), Nicola White (Holcombe).
Kate Richardson-Walsh will attempt to lead Great Britain's women to a first Champions Trophy success after head coach Danny Kerry named his 18-strong squad for the event in London.