Yaƙin Saudiyya na Hejaz, wanda kuma aka fi sani da Yaƙin Saudi-Hashemite na Biyu ko Yaƙin Hejaz-Nejd, ya faru a 1924-25.Wannan rikici da ya kasance wani bangare ne na fafatawar da aka dade ana yi tsakanin ‘yan Hashimawa na Hijaz da kuma Saudiyya na Riyadh (Nejd), ya kai ga shigar da kungiyar Hijaz a cikin yankin Saudiyya, wanda ke nuni da kawo karshen mulkin Hashemi na Hijaz.Rikicin ya barke ne lokacin da aka hana mahajjata daga Nejd shiga wurare masu tsarki a Hejaz.^[39] Abdulaziz na Nejd ya fara kamfen a ranar 29 ga Agusta 1924, inda ya kame Taif da juriya kadan.Makka ta fada hannun sojojin Saudiyya a ranar 13 ga Oktoban 1924, bayan da Sharif Hussein bin Ali ya yi watsi da rokon taimakon Birtaniya.Bayan faduwar Makka, taron Musulunci a Riyadh a watan Oktoba 1924 ya amince da ikon Ibn Saud a kan birnin.Yayin da sojojin Saudiyya suka ci gaba, sojojin Hijazi sun watse.^[39] Madina ta mika wuya a ranar 9 ga Disamba 1925, sai Yanbu.Jeddah ta mamaye a cikin Disamba 1925, tare da sojojin Saudiyya sun shiga ranar 8 ga Janairu 1926, bayan shawarwarin da suka hada da Sarki bin Ali, Abdulaziz, da karamin jakadan Burtaniya.An nada Abdulaziz Sarkin Hijaz ne bayan nasarar da ya samu, sannan aka hade yankin zuwa daular Nejd da Hijaz karkashin mulkinsa.Hussein na Hejaz, bayan ya sauka, ya koma Aqaba don tallafa wa kokarin dansa na soja amma turawan Ingila suka yi masa gudun hijira zuwa Cyprus.^[40] Ali bin Hussein ya hau gadon sarautar Hijazi a cikin yakin, amma faduwar daular ta kai ga gudun hijira na daular Hashimiya.Duk da haka, Hashimiyawa sun ci gaba da mulki a Transjordan da Iraki.