Requiem in E flat (Op.3) for ATB (using melodies from Choral-Requiem.) Printed: Leobschütz, 1899.

This Ersters Requiem in D minor, No.1 (Op.20), for choir SATB, 2 Violins, Violon, Viola, 2 Clarinets, 2 Horns and organ.

This Zweites requiem in C minor, No.2 (Op.21), is for SATB choir and organ.

This Drittes Requiem in D flat No.3 (Op.37), for mixed choir, SATB, Orgel, 2 Violins, Violon, Cello, two horns and organ.

Viertes Requiem in A minor (Op.39) for SATB, Violins, Violoncello Bass, 2 Hornes and organ or accompanied by organ alone. Printed: Leobschütz, 1899.

This Missa pro Defunctis (Op.71) for ABarB (T.) Printed: Regensburg, 1894.

Requiem in E (Op.77) for SA (TB ad lib.) and organ. Printed: Ziegenhals, Pietsch, 1895.

This Missa pro Defunctis in E flat minor, Op.80, for four voices, choir and organ. It contains:
01. Introitus: Requiem aeternam
02. Kyrie
03. Graduale: Requiem aeternam
04. Tractus: Absolve Domine
05. Offertorium: Domine Jesu Christe
06. Sanctus
07. Benedictus
08. Agnus Dei
09. Communio: Lux aeterna

Requiem in A, Op.84, for Chorus SATB, Soli SATB, 2 Vln, Vla, VCl, Violone, 2 Clarinetti, 2 Corni, Trombone, Organo.

Gruber wrote at least three requiems, one of them is not the traditional mass, but a so-called German Requiem, Op.114.

This Requiem in D minor, Op.145 (ca.1905) for one or two voices and organ/hatmonium, or: SAB choir organ, strings and two French Horns.

Missa pro Defunctis, Op.179 (1910) for three part choir and organ.

This Requiem in E flat major, Op.201 (ca.1920), for four voices, strings, two French Horns and organ.

This Requiem und Libera, Op.206 (1910), for four part male choir.

Missa pro Defunctis with Libera me, Op.219 (1911), for one or two voices and organ / harmonium.

This Requiem in B major, Op.299 for combined upper and lower voices and organ.