國立聯合大學為「臺灣國立大學系統（NUST）」之創始成員之一，該系統致力於成為中臺灣各大學間交流與合作的平台，期能達到資源互補、擴大合作基礎、促進跨領域協同效益、提升臺灣的競爭力與能見度，並強化大學系統的發展潛力。
此外，國立聯合大學亦積極參與「苗栗人文生態休閒聯盟」，該聯盟由包含政府與非政府機構在內的 8 個組織共同組成。
本校已獲臺灣環保署認證為環境教育機構，並有多位教師擔任環境教育輔導團、環境教育審議委員會及環境影響評估（EIA）審查委員會成員，定期參與會議並與政府部門及非政府組織進行對話與交流。
NUU is the funding member of National University System of Taiwan, NUST, which is dedicated to be a collaborative platform for communication and exchange among universities in central Taiwan. The aim is to seek complementary benefits, expand the basis for cooperation, create interdisciplinary synergies, enhance Taiwan's competitiveness and visibility, and strengthen the development potential of the university system. NUU is also actively involved in the Miaoli Humanities and Ecological Leisure Alliance, which consists of 8 organizations including government and non-government entities. NUU is recognized as an environmental education institution by the EPA of Taiwan. Additionally, several professors are members of the Environmental Education Counselling Group, Environmental Education Deliberation Committee, Environmental Impact Assessment, EIA, Deliberation Committee, regularly attending meetings and engaging in dialogues with government departments and NGOs.
台灣國立大學系統：https://nust.edu.tw/about.php
苗栗人文生態休閒聯盟新聞頁：https://www.miaoli.gov.tw/News_Content2.aspx?n=285&sms=9462&s=39154
苗栗縣環境影響評估委員會委員名單：https://www.mlepb.gov.tw/api/disseminate/27/20240426141958433.pdf
National University System of Taiwan:
https://nust.edu.tw/about.php
Miaoli Cultural and Ecological Leisure Alliance – Official News Page:
https://www.miaoli.gov.tw/News_Content2.aspx?n=285&sms=9462&s=39154
List of Members, Miaoli County Environmental Impact Assessment Committee:
https://www.mlepb.gov.tw/api/disseminate/27/20240426141958433.pdf