There are three bands called Ossian: a Hungarian heavy-metal band, a Scottish traditional-music group and a Polish ethnic/jazz group.

1. Ossian are a Heavy Metal band from Budapest, formed by ex-Pokolgép member, Endre Paksi in 1986. After two decades they are still active, and one of the most popular bands of the Hungarian metal scene.

Line up:
Endre Paksi - vocals (Pokolgép, Rockwell, Wellington)
Attila Wéber - guitar (Sámán)
Richárd Rubcsics - guitar (Giotin, Necro Fight, Seneca, Wellington)
Krisztián Erdélyi - bass (Falanx)
Péter Hornyák - drums (Wellington, Seneca)
Past members:
Zoltán Maróthy - guitar (Fahrenheit)
Péter Kovács T. - bass
Zsolt Galántai - drums
László Pálvölgyi - bass
Gábor Vörös - bass (Fahrenheit)
Zoltán Nagyfi - drums
Csaba Tobola - drums (Fahrenheit)
Péter Ivanov - bass
Péter Sipos (Irigy Hónaljmirigy)
Zoltán Cserfalvi (Iron Maidnem)
Viktor Jakab - bass

Releases:
1988 - Acélszív [=Heart of Steel]
1989 - Félre az útból!!! [=Get Out of the Way!!!]
1990 - A rock katonái [=The Soldiers of Rock]
1991 - Ítéletnap [=Judgement Day]
1992 - 1986-1992 (Compilation)
1992 - Kitörés [=Outbreak]
1993 - Emberi dolgok [=Human Issues]
1994 - Keresztút [=Crossroads]
1998 - Koncert [=Live]
1999 - Az utolsó lázadó (EP) [=The Last of the Rebels]
1999 - Fémzene [=Metal Music]
2000 - Gyújtópontban [=In Focus/At the Flashpoint]
2001 - Titkos ünnep [=Secret Holiday]
2002 - Árnyékból a fénybe [=From Shadow to the Light]
2003 - Hangerőmű [=Sound Factory/Powerplant of Amplifiers]
2004 - Tűzkeresztség [=Baptism of Fire]
2005 - A szabadság fantomja [The Phantom of Freedom]
2006 - A lélek hangja (Acoustic Compilation) [=The Voice of the Soul]
2006 - Létünk a bizonyíték (Live + DVD)[=Our Existance Is the Proof]
2007 - Örök tűz [=Fire Forever]
2008 - Küldetés |=Mission

2. Scottish folk band of the 1970s with the same name.
(http://www.nigelgatherer.com/perf/group2/oss.html)

3. Ossian (or Osjan) - Polish music group, formed at the begening of 70s by Jacek Ostaszewski and Marek Jackowski. They play a lot of improvised music inspired by ethnical music.
present members: Jacek Ostaszewki (flute, percussion instruments), Wojciech Waglewski (guitar), Radosław Nowakowski (percussion instruments). A very important former member is Milo Kurtis (percussion instruments).
The group co-worked with Tomasz Stańko, Apostolis Antymos and Yá-sou.