Term a ddefnyddir i ddisgrifio [[dinasyddiaeth|dinasyddion]] [[y Deyrnas Unedig]] yw '''Pobl Prydeinig''' neu '''Prydeinwyr'''. Mae hyn yn cynnwys dinasyddion [[Ynys Manaw]] ac [[Ynysoedd y Sianel]], yn ogystal a'r [[tiriogaethau tramor y Deyrnas Unedig]] a'u disgynyddion.<ref>Cfr. [[Interpretation Act 1978]], Sched. 1. By the [[British Nationality Act 1981]], s. 50 (1), the [[United Kingdom]] includes the [[Channel Islands]] and the [[Isle of Man]] for the purposes of nationality law.</ref><ref name="Dic62">Macdonald, 1969, tud. 62:<br>'''British''', ''brit'ish, adj.'' of Britain or the Commonwealth.<br>'''Briton''', ''brit'ὁn, n.'' one of the early inhabitants of Britain: a native of Great Britain.</ref><ref>{{dyf llyfr|teitl=British|awdur=[[The American Heritage Dictionary of the English Language]]|argraffiad=Fourth|url=http://dictionary.reference.com/browse/british|cyhoeddwr=dictionary.reference.com|blwyddyn=2004}}:<br>'''Brit·ish''' ''(brĭt'ĭsh) adj''.
*Of or relating to Great Britain or its people, language, or culture.
*Of or relating to the United Kingdom or the Commonwealth of Nations.
