Takazumi Katayama (片山敬済, born April 16, 1951 in Japan) is a former Grand Prix motorcycle road racing World Champion. He was the first Japanese rider to win a motorcycle road racing world championship when he claimed the 1977 350cc title aboard a Yamaha. In 1980 he accepted an offer from Honda to develop their exotic oval-cylinder, four-stroke NR500 race bike.
| Year | Class | Classification | Machine | Victories |
|---|---|---|---|---|
| 1974 | 250cc | 4th | Yamaha | 1 |
| 1975 | 250cc | 2nd | Yamaha | 1 |
| 1976 | 350cc | 7th | Yamaha | 0 |
| 1976 | 500cc | 26th | Yamaha | 0 |
| 1977 | 250cc | 4th | Yamaha | 1 |
| 1977 | 350cc | 1st | Yamaha | 5 |
| 1978 | 350cc | 2nd | Yamaha | 2 |
| 1978 | 500cc | 5th | Yamaha | 0 |
| 1980 | 500cc | 10th | Honda | 0 |
| 1981 | 500cc | - | Honda | 0 |
| 1982 | 500cc | 7th | Honda | 1 |
| 1983 | 500cc | 5th | Honda | 0 |
| 1984 | 500cc | 13th | Honda | 0 |
| 1985 | 500cc | 17th | Honda | 0 |