Tomoo Ishii (?? ??, Ishii Tomoo) (born 9 June 1923) is a Japanese professional golfer.
He was born in Shizuoka Prefecture, Japan and started playing golf at the age of 15.
Ishii won a number of events on the Japanese and Asian circuits through the 1950s and 1960s.
One of his top triumphs was at the 1964 Capital Hills Open in Manila, Philippines.
Ishii was tied for the lead with Australian golfer Peter Thomson at the beginning of the 4th round.
He outshot Thomson by four shots over the course of the final round to win.His good play helped him earn three consecutive special foreign invitations to the Masters in the mid-1960s.
He was one of the first Asian players to play in the event.
He made the cut the first two years.
He also represented Japan in the Canada Cup in 1963 and 1964.