[Yukka]

Nice I added the code you gave above at line 23 and it works well and hide healthbars on guildies. But other people around that are not in my guild still have their healthbars under their name. Where else can I put nameplate.UnitFrame.healthBar:Hide() to hide other people healthbars?

local guildie={}
local f=CreateFrame("Frame")
f:RegisterEvent("GUILD_ROSTER_UPDATE")
f:RegisterEvent("NAME_PLATE_UNIT_ADDED")
f:SetScript("OnEvent",function(self,event,unit)
    if event=="GUILD_ROSTER_UPDATE" then
        local total=GetNumGuildMembers()
        wipe(guildie)
        for i=1,total do
            local guid=select(17,GetGuildRosterInfo(i))
            local localizedClass, englishClass, localizedRace, englishRace, sex, name, realm = GetPlayerInfoByGUID(guid) 
            if guid then
                guildie[guid]=true
            end
        end
    elseif event=="NAME_PLATE_UNIT_ADDED" then
        local guid = UnitGUID(unit)     
        local localizedClass, englishClass, localizedRace, englishRace, sex, name, realm = GetPlayerInfoByGUID(guid) 
        if guildie[guid] then
            PlaySound(416)
            local nameplate = C_NamePlate.GetNamePlateForUnit(unit)
            nameplate.UnitFrame.name:SetTextColor(1,1,1,1)
            nameplate.UnitFrame.healthBar:Hide()
            print(name)
        end
    end
end)