United Nations Sacco Society (UNSACCO) Limited was started in 1975 with the objective of providing a mechanism for United Nations(UN) employees in Kenya to save and borrow at low cost in order to meet the employees' socio-economic needs.
The UNSACCO membership has grown from 131 members in 1975 to 6,800 members in 2018. In the same period, members' deposits have grown From Ksh 290,000 to Kshs 9.3 Billion while the share capital is at Ksh. 888,000 Million in 2018. The operations of the Sacco were initially done in one roomed office in Block G (UN complex) but the business is currently run in the UNSACCO block and in the second floor of Gigiri Square Building-UN Avenue. The Sacco staff has also grown both in numbers and professional experience. The membership of the UNSACCO is open to all local and international staff of UN agencies.
The Sacco has obtained high level of achievements over the years besides developing her members and the growth experienced. The sacco was among the first 7 to be registered by SASRA as a deposit taking Sacco. UNSACCO has received various outstanding awards during the annual Ushirika (Co-operatives) day celebrations.
In 2019 Ushirika celebrations, the Sacco was awarded as:
| Award | Category | Position | |
| 1 | Best Managed | Countrywide | 2 |
| 2 | Best Managed | Employer Based Tier 1 Saccos | 2 |
| 3 | Most Efficient | Countrywide | 2 |
| 4 | Most Efficient | Employer Based Tier 1 Saccos | 2 |
| 5 | Best in Savings Management | Countrywide | 1 |
| 6 | Best in Savings Management | Employer Based Tier 1 Saccos | 1 |
| 7 | Best Football Team | Countrywide | 2 |
| 8 | Best Volleyball Team | Countrywide | 3 |
