diff --git a/contrib/remind-conf-mode.06/remind-conf-mode.el b/contrib/remind-conf-mode.06/remind-conf-mode.el
index a095556c..df006f01 100644
--- a/contrib/remind-conf-mode.06/remind-conf-mode.el
+++ b/contrib/remind-conf-mode.06/remind-conf-mode.el
@@ -112,7 +112,7 @@
 	 "WARN" "UNTIL" "THROUGH" "SCANFROM" "DURATION" "TAG" "MSG" "MSF" "CAL" "SPECIAL" "IFTRIG"
 	 "PS" "PSFILE" "BANNER" "INCLUDE" "PUSH-OMIT-CONTEXT" "DEBUG" "DUMPVARS"
 	 "CLEAR-OMIT-CONTEXT" "POP-OMIT-CONTEXT"  "SET" "ERRMSG" "FSET"
-	 "EXIT" "FLUSH" "PRESERVE" "MOON" "COLOR")
+	 "EXIT" "FLUSH" "PRESERVE" "MOON" "COLOR" "COLOUR")
    #'(lambda (a b) (> (length a) (length b)))))
 
 (defconst remind-type-keywords
diff --git a/examples/remind.vim b/examples/remind.vim
index 284ca6d6..582f22ae 100644
--- a/examples/remind.vim
+++ b/examples/remind.vim
@@ -23,7 +23,7 @@ syn keyword remindExpiry	UNTIL FROM SCANFROM SCAN WARN SCHED THROUGH
 syn keyword remindTag		PRIORITY TAG
 syn keyword remindTimed		AT DURATION
 syn keyword remindMove		ONCE SKIP BEFORE AFTER
-syn keyword remindSpecial	INCLUDE INC BANNER PUSH-OMIT-CONTEXT PUSH CLEAR-OMIT-CONTEXT CLEAR POP-OMIT-CONTEXT POP COLOR
+syn keyword remindSpecial	INCLUDE INC BANNER PUSH-OMIT-CONTEXT PUSH CLEAR-OMIT-CONTEXT CLEAR POP-OMIT-CONTEXT POP COLOR COLOUR
 syn keyword remindRun		MSG MSF RUN CAL SATISFY SPECIAL PS PSFILE SHADE MOON
 syn keyword remindConditional	IF ELSE ENDIF IFTRIG
 syn keyword remindDebug		DEBUG DUMPVARS DUMP ERRMSG FLUSH PRESERVE
diff --git a/man/remind.1 b/man/remind.1
index c0c7de3b..d1a0ae3d 100644
--- a/man/remind.1
+++ b/man/remind.1
@@ -4167,6 +4167,9 @@ calendar.  Use it like this:
 	REM ... SPECIAL COLOR 0 128 0 This is a dark green reminder
 .fi
 
+You can spell COLOR either the American way ("COLOR") or the British
+way ("COLOUR").  This manual will use the American way.
+
 Immediately following COLOR should be three decimal numbers ranging
 from 0 to 255 specifying red, green and blue intensities, respectively.
 The rest of the line is the text to put in the calendar.
diff --git a/scripts/tkremind b/scripts/tkremind
index 78548216..9b50bb05 100755
--- a/scripts/tkremind
+++ b/scripts/tkremind
@@ -796,6 +796,7 @@ proc FillCalWindow {} {
 		DoMoonSpecial $n $stuff
 		continue
 	    }
+	    "COLOUR" -
 	    "COLOR" {
 		if {[regexp {^ *([0-9]+) +([0-9]+) +([0-9]+) +(.*)$} $stuff all r g b rest]} {
 		    if {$r > 255} {
@@ -822,7 +823,7 @@ proc FillCalWindow {} {
 		}
 	    }
 	}
-	if { $type != "*" && $type != "COLOR"} {
+	if { $type != "*" && $type != "COLOR" && $type != "COLOUR"} {
 	    continue
 	}
 	.cal.t$n configure -state normal
diff --git a/src/calendar.c b/src/calendar.c
index ac28a9ad..0b4ff6e7 100644
--- a/src/calendar.c
+++ b/src/calendar.c
@@ -1016,11 +1016,12 @@ static int DoCalRem(ParsePtr p, int col)
 	trig.typ = PASSTHRU_TYPE;
     }
     if (trig.typ == PASSTHRU_TYPE) {
-	if (!PsCal && strcmp(trig.passthru, "COLOR")) {
+	if (!PsCal && strcmp(trig.passthru, "COLOR") && strcmp(trig.passthru, "COLOUR")) {
 	    FreeTrig(&trig);
 	    return OK;
 	}
-	if (!strcmp(trig.passthru, "COLOR")) {
+	if (!strcmp(trig.passthru, "COLOR") ||
+	    !strcmp(trig.passthru, "COLOUR")) {
 	    is_color = 1;
 	    /* Strip off the three color numbers */
 	    DBufFree(&buf);
@@ -1073,6 +1074,7 @@ static int DoCalRem(ParsePtr p, int col)
 	    /* Suppress time if it's not today or if it's a non-COLOR special */
 	    if (jul != JulianToday ||
 		(trig.typ == PASSTHRU_TYPE &&
+		 strcmp(trig.passthru, "COLOUR") &&
 		 strcmp(trig.passthru, "COLOR"))) {
 		if (DBufPuts(&obuf, SimpleTime(NO_TIME)) != OK) {
 		    DBufFree(&obuf);
diff --git a/src/dorem.c b/src/dorem.c
index cebdb13e..e705fe0d 100644
--- a/src/dorem.c
+++ b/src/dorem.c
@@ -708,14 +708,14 @@ int TriggerReminder(ParsePtr p, Trigger *t, TimeTrig *tim, int jul)
     DBufInit(&calRow);
     DBufInit(&pre_buf);
     if (t->typ == RUN_TYPE && RunDisabled) return E_RUN_DISABLED;
-    if ((t->typ == PASSTHRU_TYPE && strcmp(t->passthru, "COLOR")) ||
+    if ((t->typ == PASSTHRU_TYPE && strcmp(t->passthru, "COLOR") && strcmp(t->passthru, "COLOUR")) ||
 	t->typ == CAL_TYPE ||
 	t->typ == PS_TYPE ||
 	t->typ == PSF_TYPE)
 	return OK;
 
     /* Handle COLOR types */
-    if (t->typ == PASSTHRU_TYPE && !strcmp(t->passthru, "COLOR")) {
+    if (t->typ == PASSTHRU_TYPE && (!strcmp(t->passthru, "COLOR") || !strcmp(t->passthru, "COLOUR")) {
 	/* Strip off three tokens */
 	r = ParseToken(p, &buf);
 	if (!NextMode) {
diff --git a/src/rem2ps.c b/src/rem2ps.c
index 245ff47a..2d7c3f17 100644
--- a/src/rem2ps.c
+++ b/src/rem2ps.c
@@ -366,6 +366,7 @@ void DoPsCal(void)
 		}
 	    }
 	} else if (!strcmp(passthru, "*") ||
+		   !strcmp(passthru, "COLOUR") ||
 	           !strcmp(passthru, "COLOR")) {
 	    /* Put on linked list */
 	    if (!CurEntries) {
@@ -375,7 +376,8 @@ void DoPsCal(void)
 		while(d->next) d = d->next;
 		d->next = c;
 	    }
-	    if (!strcmp(passthru, "COLOR")) {
+	    if (!strcmp(passthru, "COLOR") ||
+		!strcmp(passthru, "COLOUR")) {
 		c->special = SPECIAL_COLOR;
 	    }
 	}
diff --git a/www/php/remind.php b/www/php/remind.php
index 48ebfa22..2c6321d5 100644
--- a/www/php/remind.php
+++ b/www/php/remind.php
@@ -58,7 +58,7 @@ class Remind
 	if ($special === null || $special == '*') {
 	    return $this->munge_entry($day, $results, $specials, $options, $body, $e);
 	}
-	if ($special == 'COLOR') {
+	if ($special == 'COLOR' || $special == 'COLOUR') {
 	    if (preg_match('/^(\d+)\s+(\d+)\s+(\d+)\s+(.*)/', $body, $matches)) {
 		return sprintf('<span style="color: #%02x%02x%02x">%s</span>',
 			       $matches[1] % 255,
@@ -293,7 +293,7 @@ class Remind
 		$entry['file'] = $lineinfo['file'];
 		$lineinfo = 0;
 	    }
-	    if ($special != '*' && $special != 'COLOR' && $special != 'HTML') {
+	    if ($special != '*' && $special != 'COLOR' && $special != 'COLOUR' && $special != 'HTML') {
 		if (!array_key_exists($special, $specials)) {
 		    $specials[$special] = array();
 		}
diff --git a/www/rem2html b/www/rem2html
index e205f118..25d09ba5 100755
--- a/www/rem2html
+++ b/www/rem2html
@@ -257,7 +257,7 @@ sub parse_input
 			$shades->[$d] = sprintf("#%02X%02X%02X",
 						($1 % 256), ($2 % 256), ($3 % 256));
 		}
-	} elsif ($special eq 'COLOR') {
+	} elsif ($special eq 'COLOR' || $special eq 'COLOUR') {
 		if ($body =~ /(\d+)\s+(\d+)\s+(\d+)\s+(.*)$/) {
 			my($r, $g, $b, $text) = ($1, $2, $3, $4);
 			my $color = sprintf("style=\"color: #%02X%02X%02X;\"",