diff --git a/code/game/objects/items/devices/PDA/PDA.dm b/code/game/objects/items/devices/PDA/PDA.dm
index c0b510111f..4c01467239 100644
--- a/code/game/objects/items/devices/PDA/PDA.dm
+++ b/code/game/objects/items/devices/PDA/PDA.dm
@@ -92,6 +92,8 @@ GLOBAL_LIST_EMPTY(PDAs)
 	var/overlays_y_offset = 0
 
 	var/underline_flag = TRUE //flag for underline
+	
+	var/list/blocked_pdas
 
 /obj/item/pda/suicide_act(mob/living/carbon/user)
 	var/deathMessage = msg_input(user)
@@ -387,7 +389,10 @@ GLOBAL_LIST_EMPTY(PDAs)
 					for (var/obj/item/pda/P in sortNames(get_viewable_pdas()))
 						if (P == src)
 							continue
-						dat += "<li><a href='byond://?src=[REF(src)];choice=Message;target=[REF(P)]'>[P]</a>"
+						if(P.owner in blocked_pdas)
+							dat += "<li><a href='byond://?src=[REF(src)];unblock=[P.owner]'>(BLOCKED - CLICK TO UNBLOCK) [P.owner]</a>"
+						else
+							dat += "<li><a href='byond://?src=[REF(src)];choice=Message;target=[REF(P)]'>[P]</a>"
 						if(cartridge)
 							dat += cartridge.message_special(P)
 						dat += "</li>"
@@ -645,6 +650,12 @@ GLOBAL_LIST_EMPTY(PDAs)
 
 			if("MessageAll")
 				send_to_all(U)
+			
+			if("block")
+				block(usr, locate(href_list["block"]))
+			
+			if("unblock")
+				unblock(usr, href_list["unblock"])
 
 			if("cart")
 				if(cartridge)
@@ -744,9 +755,18 @@ GLOBAL_LIST_EMPTY(PDAs)
 		message += "\nSent from my PDA"
 	// Send the signal
 	var/list/string_targets = list()
-	for (var/obj/item/pda/P in targets)
-		if (P.owner && P.ownjob)  // != src is checked by the UI
+	var/blocked = 0
+	var/list/string_blocked
+	for(var/obj/item/pda/P in targets)
+		if(owner in P.blocked_pdas)
+			blocked++
+			LAZYADD(string_blocked, P.owner)
+			continue
+		if(P.owner && P.ownjob)  // != src is checked by the UI
 			string_targets += "[P.owner] ([P.ownjob])"
+	if(string_blocked)
+		string_blocked = english_list(string_blocked)
+		to_chat(user, "<span class='warning'>[icon2html(src, user)] The following PDAs have blocked your message: [string_blocked].</span>")
 	for (var/obj/machinery/computer/message_monitor/M in targets)
 		// In case of "Reply" to a message from a console, this will make the
 		// message be logged successfully. If the console is impersonating
@@ -779,12 +799,13 @@ GLOBAL_LIST_EMPTY(PDAs)
 	tnote += "<i><b>&rarr; To [target_text]:</b></i><br>[signal.format_message()]<br>"
 	// Show it to ghosts
 	var/ghost_message = "<span class='name'>[owner] </span><span class='game say'>PDA Message</span> --> <span class='name'>[target_text]</span>: <span class='message'>[signal.format_message(TRUE)]</span>"
-	for(var/mob/M in GLOB.player_list)
-		if(isobserver(M) && M.client && (M.client.prefs.chat_toggles & CHAT_GHOSTPDA))
-			to_chat(M, "[FOLLOW_LINK(M, user)] [ghost_message]")
+	if(length(string_targets))
+		for(var/mob/M in GLOB.player_list)
+			if(isobserver(M) && M.client && (M.client.prefs.chat_toggles & CHAT_GHOSTPDA))
+				to_chat(M, "[FOLLOW_LINK(M, user)] [ghost_message]")
+		to_chat(user, "<span class='info'>Message sent to [target_text]: \"[emoji_message]\"</span>")
 	// Log in the talk log
-	user.log_talk(message, LOG_PDA, tag="PDA: [initial(name)] to [target_text]")
-	to_chat(user, "<span class='info'>Message sent to [target_text]: \"[emoji_message]\"</span>")
+	user.log_talk(message, LOG_PDA, tag="PDA: [initial(name)] to [target_text] (BLOCKED:[string_blocked])")
 	if (!silent)
 		playsound(src, 'sound/machines/terminal_success.ogg', 15, 1)
 	// Reset the photo
@@ -794,8 +815,7 @@ GLOBAL_LIST_EMPTY(PDAs)
 		last_everyone = world.time
 
 /obj/item/pda/proc/receive_message(datum/signal/subspace/pda/signal)
-	tnote += "<i><b>&larr; From <a href='byond://?src=[REF(src)];choice=Message;target=[REF(signal.source)]'>[signal.data["name"]]</a> ([signal.data["job"]]):</b></i><br>[signal.format_message()]<br>"
-
+	tnote += "<i><b>&larr; From <a href='byond://?src=[REF(src)];choice=Message;target=[REF(signal.source)]'>[signal.data["name"]]</a> ([signal.data["job"]]):</b></i> <a href='byond://?src=[REF(src)];block=[REF(signal.source)]'>(BLOCK)</a><br>[signal.format_message()]<br>"
 	if (!silent)
 		playsound(src, 'sound/machines/twobeep.ogg', 50, 1)
 		audible_message("[icon2html(src, hearers(src))] *[ttone]*", null, 3)
@@ -827,6 +847,14 @@ GLOBAL_LIST_EMPTY(PDAs)
 /obj/item/pda/proc/create_message(mob/living/U, obj/item/pda/P)
 	send_message(U,list(P))
 
+/obj/item/pda/proc/block(mob/user, obj/item/pda/P)
+	to_chat(user, "<span class='notice'>[icon2html(src, user)] [P.owner] blocked from messages.</span>")
+	LAZYOR(blocked_pdas, P.owner)
+
+/obj/item/pda/proc/unblock(mob/user, unblock_target)
+	to_chat(user, "<span class='notice'>[icon2html(src, user)] [unblock_target] unblocked from messages.</span>")
+	LAZYREMOVE(blocked_pdas, unblock_target)
+
 /obj/item/pda/AltClick(mob/user)
 	. = ..()
 	if(id)
@@ -1172,4 +1200,4 @@ GLOBAL_LIST_EMPTY(PDAs)
 #undef PDA_OVERLAY_ID
 #undef PDA_OVERLAY_ITEM
 #undef PDA_OVERLAY_LIGHT
-#undef PDA_OVERLAY_PAI
\ No newline at end of file
+#undef PDA_OVERLAY_PAI