Ordo Regnum Sathanas

{{Infobox album

| name = Ordo Regnum Sathanas

| type = compilation

| artist = Horna

| cover = Ordo Regnum Sathanas.jpg

| alt =

| released = 2004

| recorded =

| venue =

| studio =

| genre = Black metal

| length = 59:31

| label = Adversary Productions

| producer =

| prev_title = Horna/Ouroboros

| prev_year = 2003

| next_title = Talismaani

| next_year = 2004

}}

Ordo Regnum Sathanas is the second compilation by the black metal band Horna. It was released on Adversary Productions in 2004 and was limited to 300 copies.