The original Federal Rules of Criminal Procedure were adopted by order of the Supreme Court on Dec. 26, 1944, transmitted to Congress by the Attorney General on Jan. 3, 1945, and became effective on Mar. 21, 1946.

The Rules have been amended Dec. 27, 1948, eff. Jan. 1, 1949; Dec. 27, 1948, eff. Oct. 20, 1949; Apr. 12, 1954, eff. July 1, 1954; Apr. 9, 1956, eff. July 8, 1956; Feb. 28, 1966, eff. July 1, 1966; Dec. 4, 1967, eff. July 1, 1968; Mar. 1, 1971, eff. July 1, 1971; Apr. 24, 1972, eff. Oct. 1, 1972; Nov. 20, 1972, eff. July 1, 1975, pursuant to Pub. L. 93–595; Mar. 18, 1974, eff. July 1, 1974; Apr. 22, 1974, eff. in part Aug. 1, 1975, and Dec. 1, 1975, pursuant to Pub. L. 93–361 and Pub. L. 94–64; Dec. 12, 1975, Pub. L. 94–149, § 5, 89 Stat. 806; Apr. 26, 1976, eff. in part Aug. 1, 1976, and Oct. 1, 1977, pursuant to Pub. L. 94–349 and Pub. L. 95–78; Apr. 30, 1979, eff. in part Aug. 1, 1979, and Dec. 1, 1980, pursuant to Pub. L. 96–42; Apr. 28, 1982, eff. Aug. 1, 1982; Oct. 12, 1982, Pub. L. 97–291, § 3, 96 Stat. 1249; Apr. 28, 1983, eff. Aug. 1, 1983; Oct. 12, 1984, Pub. L. 98–473, title II, §§ 209, 215, 404, 98 Stat. 1986, 2014, 2067; Oct. 30, 1984, Pub. L. 98–596, § 11(a), (b), 98 Stat. 3138; Apr. 29, 1985, eff. Aug. 1, 1985; Oct. 27, 1986, Pub. L. 99–570, title I, § 1009(a), 100 Stat. 3207–8; Nov. 10, 1986, Pub. L. 99–646, §§ 12(b), 24, 25(a), 54(a), 100 Stat. 3594, 3597, 3607; Mar. 9, 1987, eff. Aug. 1, 1987; Apr. 25, 1988, eff. Aug. 1, 1988; Nov. 18, 1988, Pub. L. 100–690, title VI, § 6483, title VII, §§ 7076, 7089(c), 102 Stat. 4382, 4406, 4409; Apr. 25, 1989, eff. Dec. 1, 1989; May 1, 1990, eff. Dec. 1, 1990; Apr. 30, 1991, eff. Dec. 1, 1991; Apr. 22, 1993, eff. Dec. 1, 1993; Apr. 29, 1994, eff. Dec. 1, 1994; Sept. 13, 1994, Pub. L. 103–322, title XXIII, § 230101(b), title XXXIII, § 330003(h), 108 Stat. 2078, 2141; Apr. 27, 1995, eff. Dec. 1, 1995; Apr. 23, 1996, eff. Dec. 1, 1996; Apr. 24, 1996, Pub. L. 104–132, title II, § 207(a), 110 Stat. 1236; Apr. 11, 1997, eff. Dec. 1, 1997; Apr. 24, 1998, eff. Dec. 1, 1998; Apr. 26, 1999, eff. Dec. 1, 1999; Apr. 17, 2000, eff. Dec. 1, 2000; Oct. 26, 2001, Pub. L. 107–56, title II, §§ 203(a), 219, 115 Stat. 278, 291; Apr. 29, 2002, eff. Dec. 1, 2002; Nov. 2, 2002, Pub. L. 107–273, div. C, title I, § 11019(b), 116 Stat. 1825; Nov. 25, 2002, Pub. L. 107–296, title VIII, § 895, 116 Stat. 2256; Apr. 30, 2003, Pub. L. 108–21, title VI, § 610(b), 117 Stat. 692; Apr. 26, 2004, eff. Dec. 1, 2004; Pub. L. 108–458, title VI, § 6501(a), Dec. 17, 2004, 118 Stat. 3760; Apr. 25, 2005, eff. Dec. 1, 2005; Apr. 12, 2006, eff. Dec. 1, 2006; Apr. 30, 2007, eff. Dec. 1, 2007; Apr. 23, 2008, eff. Dec. 1, 2008; Mar. 26, 2009, eff. Dec. 1, 2009; Apr. 28, 2010, eff. Dec. 1, 2010; Apr. 26, 2011, eff. Dec. 1, 2011; Apr. 23, 2012, eff. Dec. 1, 2012; Apr. 16, 2013, eff. Dec. 1, 2013; Apr. 25, 2014; eff. Dec. 1, 2014; Apr. 28, 2016, eff. Dec. 1, 2016; Pub. L. 114–324, § 2(c), Dec. 16, 2016, 130 Stat. 1948; Apr. 26, 2018, eff. Dec. 1, 2018; Apr. 25, 2019, eff. Dec. 1, 2019; Pub. L. 116–182, § 2, Oct. 21, 2020, 134 Stat. 894; Apr. 11, 2022, eff. Dec. 1, 2022; Pub. L. 117–347, title III, § 323(a)(1)(A), Jan. 5, 2023, 136 Stat. 6206; Apr. 24, 2023, eff. Dec. 1, 2023.