3rd World Science Fiction Convention

{{infobox convention

| name = Denvention I, the 3rd World Science Fiction Convention

| image =

| caption =

| status =

| genre = Science fiction

| venue = Shirley-Savoy Hotel

| location = Denver, Colorado

| country = United States

| dates = 4–6 July 1941

| organizer =

| filing =

| attendance = 90

| website =

}}

The 3rd World Science Fiction Convention (Worldcon), also known as Denvention I, was held on 4–6 July 1941 at the Shirley-Savoy Hotel in Denver, Colorado, United States.

Guest of Honor

Robert A. Heinlein, who gave a speech entitled "The Discovery of the Future"

Participants

The convention was chaired by Olon F. Wiggins.

Attendance was 90.

This was the last Worldcon before a five-year break in the annual tradition due to World War II. The next one was held in 1946.

Venue

The Shirley-Savoy Hotel. Savoy Hotel opened in 1904; Shirley Hotel opened in 1903; Hotels joined in 1919; Hotels razed in 1970.{{cite web |title=Savoy and Shirley Hotels, Denver |url=https://digital.denverlibrary.org/digital/collection/p15330coll22/id/77734/ |website=CONTENTdm |publisher=Denver Public Library |language=en}}