Sir James Martin CBE FIMechE FRAeS CEng (11 September 1893 – 5 January 1981) was an Irish engineer who together with Captain Valentine Baker founded the Martin-Baker aircraft company which is now a leading producer of aircraft ejection seats.

James Martin was born 11 September 1893 in the townland of Killinchy-in-the-Woods, known locally as Killinchy Woods (birthplace on what is now called Glasswater Road), Crossgar, County Down in Ireland. He established his own engineering firm in 1929.^[1]

In 1934, he and Valentine Baker formed Martin-Baker; Captain Baker took the test pilot role. It was in a crash of their third design, the MB 3, that Baker was killed.

In 1964 Martin was awarded the Gold Medal of the Royal Aero Club.^{[2][failed verification]}

In 2004, Martin was inducted into the International Air & Space Hall of Fame at the San Diego Air & Space Museum.^[3]

Martin's contribution to engineering was commemorated by the Northern Bank in its Inventor series of banknotes, which featured his portrait on the bank's £100 note. The note was discontinued in 2013 when the bank reissued its banknotes under the new Danske Bank brand.^[4]