"Romeo and Juliet Sealed with a Kiss" rates at 4.3/10 on IMDb. There are no specific certificates listed for this animated adaptation of the classic Shakespearean tale.
Juliet and Her Romeo - 1923 is rated/received certificates of: UK:U
Romeo and Juliet - 1915 is rated/received certificates of: UK:U
Romeo and Juliet - 2014 is rated/received certificates of: Canada:PG (British Columbia)
Romeo and Juliet - 1966 is rated/received certificates of: Australia:G Finland:K-8
Romeo and Juliet with Herpes - 2009 is rated/received certificates of: Canada:13+
Romeo and Juliet Simply Shakespeare UK - 2015 is rated/received certificates of: UK:U
Romeo and Juliet - 1954 is rated/received certificates of: Australia:G Finland:K-16 Sweden:15 West Germany:12
Shakespeare The Animated Tales - 1992 Romeo and Juliet 1-4 is rated/received certificates of: UK:U
Romeo and Juliet - 1936 is rated/received certificates of: Argentina:Atp Australia:G Finland:K-16 USA:Passed (National Board of Review) USA:Approved (PCA #2216)
Romeo and Juliet - 2013 is rated/received certificates of: Argentina:13 Canada:PG (British Columbia) Ireland:12A Ireland:PG Philippines:PG-13 Portugal:M/12 UK:PG USA:PG-13
Only one I can think of is Romeo and Juliet: Sealed with a Kiss.
Romeo - 2007 is rated/received certificates of: Spain:13