The Central Civil Services (Conduct) Rules, 1964
21. RESTRICTION REGARDING MARRIAGE:
(1) No Government servant shall enter into, or contract, a marriage with a person having a spouse living; and
(2) No Government servant having a spouse living, shall enter into, or contract, a marriage with any person:
Provided that the Central Government may permit a Government servant to enter into, or contract, any such marriage as is referred to in clause (1) or clause (2), if it is satisfied that -
(a) such marriage is permissible under the personal law applicable to such Government servant and the other party to the marriage; and
(b) there are other grounds for so doing.
(3) A Government servant who has married or marries a person other than of Indian nationality shall forthwith intimate the fact to the Government.
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