Henry James Millar (died 1959) was an Irish rugby international. He won four caps between 1904 and 1905.

After his playing career he was President of the Leinster Branch of the IRFU in the 1922/23 season as well as President of the IRFU in the 1928/29 season.

References Henry Millar at Scrum.com IRFU Profile Irish Rugby 1874 - 1999 Leinster Rugby : Past Presidents Irish Rugby : Former Presidents 1874-1949