X0101 24F-2NT LIVE 0000820892 XXXXXXXX N-1A NUVEEN INVESTMENT FUNDS INC 333 West Wacker Drive Chicago IL X1 60606 Nuveen Credit Income Fund S000005544 I C000015080 A C000015076 C C000015078 811-05309 033-16905 08/31/2023 false false S000005544 37605613.95 78350315.27 700633790.6 778984105.87 0 (741378491.92) 0.0001476 0 0 0 0 0 Jon Scott Meissner MD Tax & Financial Reporting, Fund Administration 11/15/2023 NUVEEN INVESTMENT FUNDS INC 333 West Wacker Drive Chicago IL X1 60606 Nuveen Strategic Income Fund S000005573 C C000015187 R6 C000151934 I C000015189 A C000015185 811-05309 033-16905 08/31/2023 false false S000005573 250788932.96 225458838.09 369514326.93 594973165.02 0 (344184232.06) 0.0001476 0 0 0 0 0 Jon Scott Meissner MD Tax & Financial Reporting, Fund Administration 11/15/2023