The 346th Bombardment Group was a World War II United States Army Air Forces combat organization. It served primarily in the Pacific Ocean theater of World War II.

• 461st Bombardment Squadron 1944-1946 (B-29)
• 462d Bombardment Squadron 1944-1946 (B-29)
• 463d Bombardment Squadron 1944-1946 (B-29)
• 502d Bombardment Squadron 1942-1944 (B-17, B-24)
• 503d Bombardment Squadron 1942-1944 (B-17, B-24)
• 504th Bombardment Squadron 1942-1944 (B-17, B-24)
• 505th Bombardment Squadron 1942-1944 (B-17, B-24)

• Boeing B-17 Flying Fortress
• Consoldated B-24 Liberator
• Boeing B-29 Superfortress

• Salt Lake City AAB, UT 7 Sep 1942
• Smoky Hill AAF, KS 3 Oct 1942
• Dyersburg AAFld, TN 26 Feb 1943-1 Apr 1944
• Dalhart AAFld, TX 18 Aug 1944
• Pratt AAF, KS 18 Jan 29 Jun 1945
• Kadena, Okinawa 7 Aug 1945-30 Jun 1946

Constituted as 346th Bombardment Group (Heavy) on 3 Sep 1942 and activated on 7 Sep. Assigned to Second AF. Equipped with B-17's and B-24's. Served first as an operational training and later as a replacement training unit. Inactivated on 1 Apr 1944.

Redesignated 346th Bombardment Group (Very Heavy). Activated on 8 Aug 1944. Assigned to Second AF. Prepared for combat with B-29's. Moved to the Pacific theater, Jun-Aug 1945, and assigned to Eighth AF. The war ended before the group could begin combat operations. After the war the group participated in several show-of-force missions over Japan and for a time ferried Allied prisoners of war from Okinawa to the Philippine Islands.

Inactivated on Okinawa on 30 Jun 1946

• Maurer, Maurer (1983). Air Force Combat Units Of World War II. Maxwell AFB, Alabama: Office of Air Force History. ISBN 0892010924.