Idwal is Welsh for "lord of the wall". As a masculine given name, it may refer to the following people:
Middle Ages Ordered chronologically Idwal Iwrch (reigned c. 655–682), King of Gwynedd Idwal or Ithel ap Morgan, 8th century King of Gwent and Glywysing Idwal Foel (died c. 942), King of Gwynedd Idwal ab Idwal, better known as Ieuaf (ruled 950–969), joint king of Gwynedd (with his father Idwal Foel) and possibly Powys Idwal ap Meurig (died 997), King of Gwynedd
Modern world Ordered alphabetically Idwal Davies (footballer) (1899–1980), Welsh footballer Idwal Davies (rugby) (1915–1990), Welsh dual-code rugby player Idwal H. Edwards (1895–1981), United States Air Force lieutenant general Idwal Fisher (1935–2012), Welsh rugby union and rugby league footballer Idwal Jones (writer) (1887–1964), novelist and non-fiction writer Idwal Jones (novelist) (1887–1964), Welsh-American novelist and non-fiction writer Idwal Jones (politician) (1900–1982), Welsh politician Idwal Jones (writer) (1895–1937), Welsh schoolmaster, poet and dramatist Idwal Pugh (1918–2010), Welsh civil servant Idwal Rees (1910–1991), Welsh international rugby union centre Idwal Robling (1927–2011), Welsh sports commentator