20th Century
- 1900: Robert Charles Anwyl, of Llugwy, Machynlleth
- 1901: Robert Prys Owen, of Aelybryn, Dyffryn
- 1902: Romer Williams, of Dolmelynllyn, Dolgelley
- 1903: The Hon. Harold Finch Hatton, of Plas, Harlech
- 1904: Thomas Edwards, of Blaenau, Dolgelley
- 1905: George Henry Ellis, of Pen-y-Mount, Festiniog
- 1906: Captain Athelstane Robert Pryce, of Aberllefenny, Corris
- 1907: Charles Gabriel Beale, of Bryntirion, Dolgelley
- 1908: Lieut-Col George Frederick Scott, of Penmaenucha, Dolgelley
- 1909: Colonel William Blakeway Burton, of Eryl Aran, Bala
- 1910: Captain Henry Meredyth Richards, of Caerynwch, Dolgelley
- 1911: Colonel Lewis Owen Williams, of Borthwnog, Dolgelley
- 1912: Thomas Howell William Idris, of Dolycae, Talyllyn, Corris
- 1913: John Jones of Wenallt, Dolgelley
- 1914: John Morris of Glanffrwrl Hall, Llanbedr
- 1915: Richard Thomas Jones, of Pen-y-garth, Harlech
- 1916: William Owen Roberts, of Cefn, Corwen and Rockfield, Wavertree, Liverpool
- 1917: Howell Jones Williams, of "Penrhyn", Camden Road, London
- 1918: Robert Davies Evans, of Llys Meddyg, Blaenau Festiniog
- 1919; Sir Evan Vincent Evans of Rhydfelin, Trawsfyndd, and Chancery Lane, London, WC2, Kt.
- 1920: Owen Morgan Owen, of 13, St. Petersburgh Place, London, W2
- 1921:
- 1929: Thomas Humphrey Jones, of Penygarth, Harlech
- 1930: Major Owen Daniel Jones, of Talgarth, Pennal, Maehynlleth,
- 1931: Frank Lloyd, of Waterloo House, Corwen, and Northwood, Lome Boad, Oxton
- 1933: William Fergusson Irvine, of Brynllwyn, Corwen
- 1934: Thomas Lloyd Jones, of 3, The Terrace, Corwen
- 1935:
- 1952: Sir William Llewelyn Davies, of Sherborne House, Aberystwyth
- 1953:
- 1963: Michael Wynn, 7th Baron Newborough
- 1964: Vernon Harcourt Williams of Hendre Hall, Penrhyndeudraeth
- 1965: Sir (William) Clayton Russon of Glan-y-Mawddach, Barmouth
- 1966: David Rowe Cooke of Plas Nantcol, Llanbedr, Merioneth.
- 1967: Lieut-Col Edward Roger Nanney-Wynn, of Llanfendigaid, Towyn
- 1968: Dr. Owain Merfyn Prichard, of Tristan, Penrhyndeudraeth
- 1969: Robert William Manners, of Bryntirion, Corwen.
- 1970: John Evans Tudor, of Bryn Adda, Dolgellau.
- 1971: Herbert Francis Shuker, of Ty Mawr, Towyn.
- 1972: Captain Henry Herman Evelyn Montagu Winch, of Castle Barn, Minffardd, Penrhyndeudraeth.
- 1973: Lady (Gladys Nellie) Russon, of Glan-y-Mawddach, near Barmouth.
- 1974 onwards - See High Sheriff of Gwynedd
Read more about this topic: High Sheriff Of Merionethshire