Type 21 can refer to:
- Type 21 frigate, or Amazon-class frigate, a late-20th-century escort vessel of the Royal Navy.
- Type 021-class missile boat, a Chinese missile-firing naval vessel first produced in about 1975, and still in production.
- Type XXI submarine, a German technologically advanced submarine produced in 1945.
- Type 21 Radar, a radar of the Imperial Japanese Navy
See also edit
This disambiguation page lists articles associated with the title Type 21.
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