The Legal Office of the Archdiocese of Nairobi is mainly tasked with the following functions:
a) Advisory;
b) Drafting and reviewing contracts; and,
c) Liaising with Advocates in the panel of the Archdiocese.

a) Advisory
The Legal Office of the Archdiocese advises all departments within the secretariat on legal issues that arise from their day-to-day operations. The advisory role is also extended to the individual parishes especially through their parish priests, to the religious congregations operating within the Archdiocese, the institutions established within the Archdiocese and to individual Christians as are referred to it from time to time through the offices of His Eminence and His Lordship.

b) Drafting and reviewing contracts
The Legal Office drafts and reviews commercial contracts that the Archdiocese engages in with other entities that need its services and also that provide services to it. It also drafts employment contracts for use within the parishes and institutions within the Archdiocese.

c) Liaising with Advocates in the panel of the Archdiocese
The Legal Office liaises with the advocates in the panel of the Archdiocese to ensure that they obtain all the relevant information and help that they need so as to effectively handle and address legal issues that the Archdiocese may be involved with or are of concern to it.