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A facile one-pot green synthesis of gold nanoparticles (AuNPs) with different geometries was achieved using an underutilized Himalayan bioresource Hippophae rhamnoides. Aqueous leaf (LE) and berry extracts (BE) showed rapid synthesis of monodispersed spherical LEAuNPs (27 ± 3.2 nm) and anisotropic BEAuNPs (55 ± 4.5 nm) within 2 and 15 min, respectively. The Fourier-transform infrared (FTIR) spectroscopy showed involvement of polyphenolics/flavonoids in AuNPs reduction. LE AuNPs (IC₅₀ 49 µg) exhibited higher antioxidant potential than BE AuNPs (IC₅₀ 57 µg). Both BE nanotriangles and LE nanospheres exhibited cytotoxicity against Jurkat cell lines. These nanocatalysts also exhibited effective (80–99%) reductive degradation of structurally different carcinogenic azo dyes. Kinetic studies revealed that BE nanotriangles exhibited higher catalytic efficiency (14–67%) than LE nanospheres …