Minor quantities of Ag have been added to Al-Li-Cu-Mg-Zr alloys. Their microstructure has been studied by means of optical metallography, transmission electron microscopy and X-ray diffraction. In the high Li, low Cu: Mg ratio alloys the main phases found were delta＇, beta＇, S＇ and T-1, while fewer T-2 and Al7Cu2Fe precipitates were also observed. The addition of up to 0.5 wt % Ag diminishes the delta＇ and T-1 precipitates size. This is attributed to a small increase of Li solubility in the matrix. In the low Li, high Cu:Mg ratio alloy the addition of 0.2 wt % Ag resulted in the precipitation of Omega phase simultaneously with delta＇, beta＇, S＇ and T-1 phases. Due to the low Li concentration an unusual growth of the delta＇/beta＇ precipitates at the expense of the delta＇ precipitates was also observed.