Thornes Park, owned and managed by Wakefield Metropolitan District Council, dates back to 1778 and became a public park in 1891, though the site incorporates mediaeval earthworks.
Explaining the listing, English Heritage's report states: "the park's layout survives mostly intact".
Council leader Cllr Peter Box said: "This will enable us to bid for new avenues of funding to restore or invest in the park, and also means that any changes that are proposed must be done in full consultation with English Heritage."
Fleetwood Memorial Park, amanged by Wyre Council, was designed by noted town planner Sir Patrick Abercrombie in 1926.
The layout survives "relatively intact" according to EH's report, which points out the relative rarity of First World War memorial gardens, only two of which have previously been listed.