diff --git a/dnsapi/dns_calrissia.sh b/dnsapi/dns_calrissia.sh
new file mode 100644
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--- /dev/null
+++ b/dnsapi/dns_calrissia.sh
@@ -0,0 +1,137 @@
+#!/usr/bin/env sh
+# shellcheck disable=SC2034
+dns_calrissia_info='Calrissia.be DNS API
+Site: calrissia.be
+Docs: github.com/acmesh-official/acme.sh/wiki/dnsapi2#dns_calrissia
+Options:
+ CALRISSIA_TOKEN Personal access token
+Issues: github.com/acmesh-official/acme.sh/issues/6809
+Author: Ward Hus
+'
+
+CALRISSIA_API="https://my.calrissia.com/api"
+
+dns_calrissia_add() {
+  fulldomain="$1"
+  txtvalue="$2"
+
+  _calrissia_load_token || return 1
+
+  if ! _calrissia_get_root "$fulldomain"; then
+    _err "Unable to find domain in Calrissia account for: $fulldomain"
+    return 1
+  fi
+
+  _debug "domain='$_domain' id='$_domain_id' sub='$_sub_domain'"
+  _info "Adding TXT record for $fulldomain"
+
+  _body="{\"name\":\"$_sub_domain\",\"type\":\"TXT\",\"content\":\"$txtvalue\",\"ttl\":120,\"prio\":0}"
+  _response="$(_calrissia_request POST "/domain/$_domain_id/record" "$_body")"
+
+  if ! _contains "$_response" '"id"'; then
+    _err "Failed to create TXT record: $_response"
+    return 1
+  fi
+
+  return 0
+}
+
+dns_calrissia_rm() {
+  fulldomain="$1"
+  txtvalue="$2"
+
+  _calrissia_load_token || return 1
+
+  if ! _calrissia_get_root "$fulldomain"; then
+    _err "Unable to find domain in Calrissia account for: $fulldomain"
+    return 1
+  fi
+
+  _debug "domain='$_domain' id='$_domain_id' sub='$_sub_domain'"
+
+  # Look the record up from the API instead of relying on local state.
+  # The record list is embedded in the domain object.
+  _response="$(_calrissia_request GET "/domain/$_domain_id")"
+  _debug2 "Response: $_response"
+
+  # Split the record objects onto separate lines, then match on both the
+  # subdomain name and the TXT value to find the record id to delete.
+  _record_id="$(printf "%s" "$_response" |
+    tr '{}' '\n' |
+    grep "\"name\" *: *\"$_sub_domain\"" |
+    grep "\"content\" *: *\"$txtvalue\"" |
+    _egrep_o '"id" *: *[0-9]+' |
+    _head_n 1 |
+    _egrep_o '[0-9]+')"
+
+  if [ -z "$_record_id" ]; then
+    _info "No matching TXT record found for $fulldomain; nothing to remove"
+    return 0
+  fi
+
+  _info "Removing TXT record id=$_record_id from domain id=$_domain_id"
+  if ! _response="$(_calrissia_request DELETE "/domain/$_domain_id/record/$_record_id")" || _contains "$_response" '"error"'; then
+    _err "Failed to remove TXT record: $_response"
+    return 1
+  fi
+  return 0
+}
+
+####################
+# Private helpers  #
+####################
+
+_calrissia_load_token() {
+  CALRISSIA_TOKEN="${CALRISSIA_TOKEN:-$(_readaccountconf_mutable CALRISSIA_TOKEN)}"
+  if [ -z "$CALRISSIA_TOKEN" ]; then
+    _err "CALRISSIA_TOKEN is not set. Generate one at https://identity.calrissia.com under API Keys."
+    return 1
+  fi
+  _saveaccountconf_mutable CALRISSIA_TOKEN "$CALRISSIA_TOKEN"
+}
+
+# Sets _domain, _domain_id, _sub_domain for a given FQDN.
+_calrissia_get_root() {
+  _fqdn="$1"
+
+  i=1
+  while true; do
+    _candidate="$(printf "%s" "$_fqdn" | cut -d . -f "$i"-)"
+    [ -z "$_candidate" ] && return 1
+
+    _debug "Trying root domain: $_candidate"
+    _response="$(_calrissia_request GET "/domain?full_domain_name=$_candidate")"
+    _debug2 "Response: $_response"
+
+    _domain_id="$(printf "%s" "$_response" |
+      _egrep_o '"id" *: *[0-9]+' |
+      _head_n 1 |
+      _egrep_o '[0-9]+')"
+
+    if [ -n "$_domain_id" ]; then
+      if [ "$i" = "1" ]; then
+        # The FQDN itself is the zone apex, e.g. a challenge-alias domain.
+        _sub_domain=""
+      else
+        _sub_domain="$(printf "%s" "$_fqdn" | cut -d . -f "1-$((i - 1))")"
+      fi
+      _domain="$_candidate"
+      return 0
+    fi
+
+    i=$((i + 1))
+  done
+}
+
+_calrissia_request() {
+  _method="$1"
+  _path="$2"
+  _body="$3"
+  export _H1="Authorization: Bearer $CALRISSIA_TOKEN"
+  export _H2="Accept: application/json"
+  if [ "$_method" = "GET" ]; then
+    _get "$CALRISSIA_API$_path"
+  else
+    _post "$_body" "$CALRISSIA_API$_path" "" "$_method" "application/json"
+  fi
+}