ミスリルアーマー [mythril armor] in Japanese.
Final Fantasy II
Stats: DEF +10, EVA -14%
Equip: all
Obtain: ?
Description: Armor made of mythril
Final Fantasy III

Stats: DEF 10, MDEF 3, weight 1
Use: FRE, ONK, WAR, THF, RDM, RNG, KNT, DRG, VIK, DRK
Buy: 350 gil (sell: ? gil)
Shop: Kazus, Canaan
Type: Body
Final Fantasy IV
Stats: DEF 13, MDEF 4, EVA 0, MEVA 2
Equip: Cecil, Cid, Kain
Buy: 17,000 gil (sell: 8,500 gil)
Shop: Mythril
Drop: Mythril Golem
Obtain: starting armor on Kain (2nd time)
Final Fantasy V
Stats: DEF 9, MDEF 2, weight +8
Equip: Knight, Dragoon, Samurai, Berserker, Magic Knight, Mime, Gladiator
Buy: 700 gil (Sell: 350 gil)
Shop: Karnak
Final Fantasy IX
Stats: DEF +15, halve Water
Equip: Steiner, Freya, Beatrix
Abilities: Cover, Jelly
Buy: 1,830 gil (sell: 665 gil)
Shop: Cleyra (Burmecian soldier Dan's shop), Lindblum (Dragoos' shop (disc 2-3)), Alexandria (weapon shop (disc 3)), Treno (knight equipment shop (disc 3)), Esto Gaza (equipment shop (before Desert Palace))
Steal: Thorn
Use: Grand Armor
Description: Armor made of mythril
Type: Heavy Armor
A New Empire

Stats: (unknown)
Obtain: ?
Description: Extraordinary armor forged from mythril
Type: Body Armor
Final Fantasy Tactics
Stats: HP +50
Equip (job): Knight, Dragoon, Samurai, Dark Knight, Onion Knight
Equip (character): Squire (Ramza, ch2+), Fell Knight, Holy Knight, Game Hunter, Templar, Sky Pirate, Sword Saint, Divine Knight, Ark Knight
Equip (enemy): level 11
Buy: 2,000 gil (sell: 1,000 gil)
Shop: (available from the start of ch2) Lesalia, Castles
Description: Armor made from the valuable metal known as mythril. It is surprisingly light and sturdy.
Other: other jobs can equip with Equip Heavy Armor
Pictlogica

Stats (lv1): DEF +15
Buy: - (sell: ? gil)
Obtain: Saronia Waterways
Type: Accessory, Rarity: ★★, Element: -
Record Keeper

Mythril Armor (IV)
Stats: DEF +15, MDEF +6, EVA 96 (lv1), ? (lv5), ? (lv10), DEF +43, MDEF +18, EVA 96 (lv15)
Max Level: lv5 (initial), lv10 (first evolve), lv15 (second evolve)
Type: Armor, Rarity: ★★
Category: Equipment