Ippei Kojima (born 1944) is a former Japanese badminton player who won a record eight Japanese national men's singles titles and some major international titles between the mid-1960s and the mid-1970s. His game was marked by exceptional foot speed, great tenacity, and power surprising for a man who was about five feet (1.524 meters) tall. Kojima is the only Japanese player to have won men's singles at the prestigious Danish Open (1970). He also shared the Danish Open men's doubles title, with different partners, in 1968 and 1969. In 1970 he reached the final of all three events at both the U.S. and Canadian Open championships, winning men's doubles in the U.S. and both singles and mixed doubles in Canada. In 1971 he won men's singles over a select field in a one-time-only event held in conjunction with the Calgary (Canada) Stampede, defeating Denmark's Svend Pri in the final. Perhaps the most notable matches of Kojima's career were a series of close but losing singles efforts against the iconic Rudy Hartono in Thomas Cup, the All-Englands, and other major venues in 1970 and 1971.