Guide to obtain titles, styles, and honorifics in the United Kingdom and such.
Duke & Duchess
Marquess & Marchioness
Earl & Countess
Viscount & Viscountess
Baron & Baroness
Baronet & Baronetess
Knights
Esquire
His/Her Majesty (HM)
Be the monarch
Be a wife of the monarch
His/Her Royal Highness (HRH)
Be a child of the monarch
Be a male-line grandchild of the monarch
His/Her Grace
Hold a Dukedom
Become an Archbishop
The Honourable (Hon.)
Be a child of a Baron, Viscount, or a life peerage holder
Be a younger son of an Earl
Marry the two above
Be a judge of the High Court
Members of Commonwealth executive and legislative councils, of which is bicameral
The Right Honourable (The Rt. Hon)
Become a Member of the Privy Council
Hold the title of Earl or Countess, Viscount or Viscountess, and Baron and Baroness
Become a wife or widow of the above titleholders
Hold a Lord Mayor or Lord Provost office
The Reverend (The Revd.)
Clergy
The Right Reverend (The Rt Revd.)
Become a Bishop
Serve current as Moderator of the General Assembly of the Church of Scotland
The Very Reverend (The Very Revd.)
Become former Moderator of the General Assembly of the Church of Scotland
Be a provost or dean of the Scottish Episcopal Church
The Most Reverend (The Most Revd.)
Become an Archbishop
MP - Member of Parliament
Bt - Baronet
PC - Privy Councellor
KG - Knight of the Garter
KB - Knight of the Order of the Bath
KT - Knight of the Thistle
Mister (Mr.)
Be a man with no higher title
Master (Mstr.)
Be a boy
Be an heir of a Scottish peerage
Miss
Be a girl
Be a unmarried woman with no higher title
Mrs.
Be a married woman with no higher title
Ms.
Be a woman with no higher title
Doctor (Dr.)
Hold a doctorate degree
Be a registered medical practitioner
Professor (Prof.)
Hold a professorship