- Jacq
- Campamula alpina jacq. [Známka 2365] [Stamp 2365]
- Jamesonii
- Jessenii
- Johannis Jessenii a Iessen [Známka 893] [Stamp 893]
- Jo
- Nymphalis jo L. [Známka 1221] [Stamp 1221]
- Johannis
- Johannis Jessenii a Iessen [Známka 893] [Stamp 893]
- Johnstoni
- Okapia johnstoni [Aršik 894] [Souvenir Sheet 894]
- Jubatus
- Acinonyx jubatus [Kupon 897] [Coupon 897]
- Juncea
- Aeshna juncea [Známka 693] [Stamp 693]