The 1990 Individual Speedway Junior World Championship was the 14th edition of the World motorcycle speedway Under-21 Championships.

[1][2][3] The championship was won by Chris Louis of England.

[4][5][6] m - exclusion for exceeding two minute time allowance • t - exclusion for touching the tapes • x - other exclusion • e - retired or mechanical failure • f - fell • ns - non-starter • nc - non-classify