University of California, Irvine Arboretum, Botanical garden at University of California, Irvine, United States

The University of California, Irvine Arboretum is a 12.5-acre botanical garden and arboretum north of the main UCI campus, on Campus Drive near the San Joaquin Wildlife Sanctuary and Upper Newport Bay. Its two main collections are plants of the California Floristic Province and plants of South Africa, with an aloe collection among the holdings.

The arboretum was founded in the 1960s and has focused on preserving plant species native to California, including varieties from the Channel Islands and Baja California. This focus reflects the university's commitment to documenting and understanding the region's plant life.

The arboretum serves as a teaching space where university students and faculty conduct research on plant biology and regional ecosystems. Visitors can observe how the grounds are used daily for scientific observation and hands-on learning.

The arboretum is no longer open to the public on ordinary days; visits are possible only during quarterly open houses. It sits north of the main UCI campus on Campus Drive, next to the San Joaquin Wildlife Sanctuary and Upper Newport Bay. The entrance is free.

The aloe collection is catalogued at 130 species and 145 taxa, alongside 80 Haworthia species and 71 Gladiolus species. The arboretum's herbarium is registered under the code IRVC with Botanic Gardens Conservation International.